Samsung Galaxy K Zoom (4G SM-C115) vs Samsung Galaxy S21 Ultra (SM-G998N 512GB)

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Side by side comparison between Samsung Galaxy K Zoom vs Samsung Galaxy S21 Ultra phones, differences, pros, cons and full specifications. What's the better?

11/19/2021 2:06 AM, updated: 5/19/2025 11:26 AM

Compare Samsung Galaxy S21 Ultra X Samsung Galaxy K Zoom (4G SM-C115) 06Points

Specifications Compare Models Pictures

4.8"
AMOLED

720x1280

20.7
MP

2.1mp

2GB
RAM

Hexa-core

2430
mAh

(Removable)

31Points Samsung Galaxy S21 Ultra (SM-G998N 512GB) Compare Samsung Galaxy K Zoom X

Specifications Compare Models Pictures

6.8"
AMOLED

1440x3200

108
MP

40mp

16GB
RAM

Octa-core

5000
mAh

(Non removable)

What's the better phone? Samsung Galaxy S21 Ultra (SM-G998N 512GB)

The phonemore's choice is much more technical than personal. Therefore, you shouldn't only consider this. Our goal is to help you, but what's important to us may not be important to you. You decide which one is the best! Comment!

6 Advantages Samsung Galaxy K Zoom (4G SM-C115)	vs	31 Advantages Samsung Galaxy S21 Ultra (SM-G998N 512GB)
+Until 64GB microSD, microSDXCAdvantage More external storage for files using memory cards	vs	Not supported
+200 grams (7 ounces)14% Lighter	vs	227 grams (7.95 ounces)
+Xenon flashAdvantage The Xenon flash helps in dark places or in low light	vs	LED flash
+ANT+Advantage Sensors help you use the device	vs	Not supported
+Li-Ion: lithium-ion (Removable)Advantage Removable battery can be replaced easily	vs	LiPo: li-ion polymer (Non removable)
+3.5mm jackAdvantage Headsets with 3.5mm Jack size are more common and easy to find in stores	vs	Type-C reversible connector
1.7GHz 32bit Hexa-core	vs	+2.9GHz 64bit Octa-core (5nm)137% More powerful processor, you can open your applications faster
2GB LPDDR3	vs	+16GB LPDDR57 times More RAM memory. Typically more responsive and better for multitasking.
8GB (5GB available)	vs	+512GB (457GB available)90 times More internal storage for applications and files
eMMC 5.0	vs	+UFS 3.1Advantage Fastest write and read storage.
16.6 millimeters (0.65 inches)	vs	+8.9 millimeters (0.35 inches)87% Thinner
Plastic body, glass front	vs	+Aluminum frame, glass front/backAdvantage More resistant material
720x1280 pixels	vs	+1440x3200 pixels4 times Higher resolution screen
306 PPI	vs	+516 PPI69% Crisper display of text, images and videos because it has more pixels per inch (ppi)
4.8"	vs	+6.8"42% Larger screen
(back) 20.7MP	vs	+(quad camera) 108MP + 10MP + 10MP + 12MP6 times Higher resolution main camera
HDR photo only main camera	vs	+HDR photo/video on both camerasAdvantage The HDR technology produced photos with more detail in dark areas
1/2.3" inches	vs	+1/1.33" inches73% The larger sensor camera lets you take photos with better depth.
f/3.1 (aperture)	vs	+f/1.8 (aperture)72% Diaphragm opening (Aperture) of the camera which has the smallest F number takes photos with better light exposure.
(front) 2.1MP	vs	+(front) 40MP18 times Higher resolution secondary camera to take pictures and selfies
Full HD (1920x1080)	vs	+8K UHD (7680x4320)15 times More image quality for recording videos with the primary camera
(front) Full HD (1920x1080)	vs	+(front) 4K UHD (3840x2160)3 times More image quality for recording videos with the secondary camera
Android 4.4.2 KitKat	vs	+Android 15Advantage Android 15 is newer and safer
4G LTE	vs	+5G SA/NSAAdvantage The 5G SA/NSA network is newer and faster
(4G LTE) 150 Mbps	vs	+(5G SA/NSA) 5000 Mbps32 times Faster for surfing the internet and download files
Not supported	vs	+BarometerAdvantage Sensors help you use the device
Not supported	vs	+Face unlockAdvantage Sensors help you use the device
Not supported	vs	+Fingerprint sensor (under display)Advantage Sensors help you use the device
Not supported	vs	+UWB (Ultra Wideband)Advantage Sensors help you use the device
2430 mAh	vs	+5000 mAh106% Battery - higher amperage (mAh) allows more device usage time, but it also depends on the hardware and use
Not supported	vs	+FMAdvantage The radio lets you listen to your songs and sports in general
802.11 a/b/g/n [wifi4]	vs	+802.11 a/b/g/n/ac/ax [wifi6]Advantage WiFi 802.11 a/b/g/n/ac/ax [wifi6] is newer and faster
Not supported	vs	+DLNAAdvantage With DLNA technology you can access and play media files on TV, tablet or DLNA compatible device.
4.0 + A2DP	vs	+5.2 + A2DP/LEAdvantage Bluetooth 5.2 + A2DP/LE is newer and faster
MicroUSB 2.0, USB OTG On-The-Go	vs	+USB 3.2 Type-C, USB OTG On-The-GoAdvantage Newer and faster USB version for transferring photos, mp3 or data.
MicroUSB 2.0, USB OTG On-The-Go	vs	+Type-CAdvantage Reversible connector, you can stick in a USB-C cable any which way; either side is up.
Not supported	vs	+IP68 certifiedAdvantage Protection against water allows you talk to your friends in the rain, for example

21 Common items in both devices

Super AMOLED / Dynamic AMOLED

16 million

Digital and optical zoom

Autofocus / PDAF: phase detection autofocus on both cameras

OIS: Optical stabilization

BSI sensor

Capacitive

+14 specs and more in the table below

Check the comparison table below for more items that are not evaluated in comparison score above.

Highlight differences

📱 Model features
	Galaxy K Zoom (4G SM-C115)	Galaxy S21 Ultra (SM-G998N 512GB)
Change model		Choose the model
Model	Galaxy K Zoom (4G SM-C115)	Galaxy S21 Ultra (SM-G998N 512GB)
Other model names	Samsung Galaxy S5 zoom, Galaxy K zoom LTE C115L	갤럭시 S21 Ultra 5G (SM-G998N Single-SIM)
Country or region available	(Global, International), USA	South Korea
Brand	Samsung	Samsung
Release date	6/1/2014	1/29/2021, Announced: 1/14/2021
Depth	16.6 millimeters (0.65 inches)	8.9 millimeters (0.35 inches)
Size (width x height)	70.8 x 137.5 millimeters (2.79 x 5.41 in)	75.6 x 165.1 millimeters (2.98 x 6.5 in)
Weight	200 grams (7 ounces)	227 grams (7.95 ounces)
Build, materials	Plastic body, glass front	Aluminum frame, glass front/back
Protection against water and others	Not supported	IP68 certified: water-resistant up to 1.5 meters for 30min and dust-resistant
📲 Display
	Galaxy K Zoom (4G SM-C115)	Galaxy S21 Ultra (SM-G998N 512GB)
Display type	Super AMOLED	Dynamic AMOLED
Screen size	4.8" inches	6.8" inches
Screen-to-body ratio	~65.2% (screen-to-body ratio)	~89.4% (screen-to-body ratio)
Display resolution	720x1280 pixels	1440x3200 pixels (20:9)
Touchscreen	Capacitive Multitouch	Capacitive Multitouch 10-points
Pixel density (dot pitch)	306 PPI	516 PPI
Colors	16 million	16 million
Scratch-resistant glass	Gorilla Glass 3	Gorilla Glass Victus
Refresh rate	feature not registered	120Hz
Display features	feature not registered	1500nits[peak] HDR10+ Always-On Display
🤖 Operating System
	Galaxy K Zoom (4G SM-C115)	Galaxy S21 Ultra (SM-G998N 512GB)
System version	Android 4.4.2 KitKat	Android 11
Firmware update	feature not registered	Android 15
User Interface	feature not registered	One UI 3.1 / 4.1 / 5.1 / 6.0 / 7.0
⚙️ Processor
	Galaxy K Zoom (4G SM-C115)	Galaxy S21 Ultra (SM-G998N 512GB)
Chipset	32bit: Samsung Exynos 5 Hexa 5260 (28nm)	64bit: Samsung Exynos 2100 (5nm)
CPU	Hexa-core, 2 processors: 2x 1.7GHz ARM Cortex-A15 (Dual-core) 4x 1.3GHz ARM Cortex-A7 (Quad-core)	Octa-core, 3 processors: 1x 2.9GHz ARM Cortex-X1 (Single-core) 3x 2.8GHz ARM Cortex-A78 (Triple-core) 4x 2.2GHz ARM Cortex-A55 (Quad-core)
GPU graphical controller	ARM Mali-T624 MP4	ARM Mali-G78 MP14 (854MHz)
Performance (benchmark)	feature not registered	AnTuTu: 657150 (v8), 727634 (v9) Geekbench: 3457 (v5.2) GFXBench: 51fps (ES 3.1 onscreen)
💽 Memory and storage
	Galaxy K Zoom (4G SM-C115)	Galaxy S21 Ultra (SM-G998N 512GB)
RAM memory	2GB LPDDR3	16GB LPDDR5
Internal storage	8GB (5GB available) eMMC 5.0	512GB (457GB available) UFS 3.1
External storage	Until 64GB microSD, microSDXC (dedicated slot)	Not supported
📶 Mobile networks
	Galaxy K Zoom (4G SM-C115)	Galaxy S21 Ultra (SM-G998N 512GB)
Dual-SIM	Not supported	Not supported
SIM card	1 slot (Single-SIM) micro-SIM (3FF)	1 slot (Single-SIM) nano-SIM (4FF)
Maximum Download / Upload	150/50 Mbps	5000/1920 Mbps
Network technology	2G, 3G, 4G	2G, 3G, 4G, 5G
Frequency, bands	Expand band details Collapse details
GSM MHz band	Quad-Band 850/900/1800/1900	Quad-Band 850/900/1800/1900
Primary 2G network	GSM 850/900/1800/1900	GSM 850/900/1800/1900
Primary 3G network	UMTS 850/900/1900/2100	UMTS 850/900/1700/1900/2100
Primary 4G network	LTE Cat4 (Bands 1, 3, 5, 7, 8, 20)	LTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 66) TD-LTE (38, 39, 40, 41) VoLTE
Primary 5G network	Not supported	SA/NSA/Sub6 (77, 78)
Primary data network	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, LTE	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA
Secondary 2G network	Not supported	Not supported
Secondary 3G network	Not supported	Not supported
Secondary 4G network	Not supported	Not supported
Secondary data network	Not supported	Not supported
📷 Camera
	Galaxy K Zoom (4G SM-C115)	Galaxy S21 Ultra (SM-G998N 512GB)
Back camera (main camera)	20.7 megapixels	(quad camera) 108 megapixels 10MP periscope telephoto f/4.9240mm1/3.24"1.22µmPDAFOIS10x-optical-zoom 10MP telephoto f/2.470mm1/3.24"1.22µmPDAFOIS3x-optical-zoom 12MP ultrawide f/2.213mm1/2.55"1.4µmPDAFSuper-Steady-video
Main camera resolution	5248x3936 pixels	12000x9000 pixels
Video recording (primary)	Full HD (1920x1080) 60 fps	8K UHD (7680x4320) 24 fps
Flash	Xenon flash	LED flash
Focal aperture	f/3.1 (aperture)	f/1.8 (aperture)
Focal length	feature not registered	26mm (lens)
Sensor size	1/2.3" inches	1/1.33" inches
Pixel size	feature not registered	1.8µm pixel
Autofocus	Autofocus	PDAF: phase detection autofocus on both cameras
Touch focus	Supported	Supported
Image stabilization	OIS: Optical stabilization	OIS: Optical stabilization
Zoom	Digital and optical zoom	Digital and optical zoom
Face/smile detection	Face detection, Smile detection	Face detection, Smile detection
BSI sensor	Supported	Supported
HDR	HDR photo only main camera	HDR photo/video on both cameras
Camera extras	feature not registered	4K@60fps 1080p@240fps 720p@960fps
📸 Front camera
	Galaxy K Zoom (4G SM-C115)	Galaxy S21 Ultra (SM-G998N 512GB)
Front camera (secondary)	2.1 megapixels	40 megapixels
Front camera resolution	1920x1080 pixels	7296x5472 pixels
Video recording (secondary)	Full HD (1920x1080)	4K UHD (3840x2160)
Front flash	Not supported	Not supported
Focal aperture	feature not registered	f/2.2 (aperture)
Focal length	feature not registered	26mm (lens)
Sensor size	feature not registered	1/2.8" inches
Pixel size	feature not registered	0.7µm pixel
🔉 Sound and multimedia
	Galaxy K Zoom (4G SM-C115)	Galaxy S21 Ultra (SM-G998N 512GB)
Loudspeaker	Supported	Stereo sound 32-bit/384kHz Dolby Atmos Tuned by AKG
Active noise cancellation	2 microphones or more	3 microphones
Radio	Not supported	FM
TV	Not supported	Not supported
Video formats	MP4, DivX, XviD, H.264, H.263, WMV	MP4, H.265, H.264, H.263, XviD, MKV
Audio formats	MP3, WAV, eAAC+, FLAC	MP3, WAV, WMA, eAAC+, FLAC
🔌 Connectivity
	Galaxy K Zoom (4G SM-C115)	Galaxy S21 Ultra (SM-G998N 512GB)
USB	MicroUSB 2.0, USB OTG On-The-Go	USB 3.2 Type-C, USB OTG On-The-Go
Audio output	3.5mm jack	Type-C reversible connector
TV output	Micro-B USB MHL	USB Type-C (reversible)
Bluetooth	4.0 + A2DP	5.2 + A2DP/LE
WiFi	802.11 a/b/g/n [wifi4] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot	802.11 a/b/g/n/ac/ax [wifi6] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot
DLNA	Not supported	Supported
GPS	A-GPS, GeoTagging, GLONASS	A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou
NFC	Supported	Supported
Infrared port	Supported	Not supported
🧭 Sensors
	Galaxy K Zoom (4G SM-C115)	Galaxy S21 Ultra (SM-G998N 512GB)
Sensors	Accelerometer Ambient light sensor ANT+ Compass Gyroscope Proximity sensor	Accelerometer Ambient light sensor Barometer Compass Face unlock Fingerprint sensor (under display) Gesture Gyroscope Hall effect Proximity sensor UWB (Ultra Wideband)
Vibrating alert	Supported	Supported
🔋 Battery
	Galaxy K Zoom (4G SM-C115)	Galaxy S21 Ultra (SM-G998N 512GB)
Battery type	Li-Ion: lithium-ion (Removable)	LiPo: li-ion polymer (Non removable)
Battery capacity	2430 mAh	5000 mAh
Charger, watts	Wired charging	25W Wired fast charging USB Power Delivery 3.0
Inductive / wireless charging	feature not registered	15W Qi wireless charging (Qi/PMA) 4.5W Reverse wireless charging
Talk time autonomy	14 hours	feature not registered
Standby	feature not registered	feature not registered
➕ Other features
	Galaxy K Zoom (4G SM-C115)	Galaxy S21 Ultra (SM-G998N 512GB)
Call control	Voice recorder	Voice dialing, Voice recorder, Voice commands
Messaging	SMS (Swype), MMS, E-mail, Push mail	SMS (T9), MMS, E-mail, Push mail
Hands-free calling	Supported	Supported
Video calling	Supported	Supported
Ringtones	Polyphonic and customized	Polyphonic and customized
Web browser	HTML, XHTML, HTML5	HTML, XHTML, HTML5
Antenna	Internal antenna	Internal antenna
Qwerty physical keyboard	Not supported	Not supported
Miscellaneous	• Colors: Charcoal Black, Electric Blue, Shimmery White • 2 processors: Quad-core 1.3GHz + Dual-core 1.7GHz • Samsung TouchWiz UX • Dropbox 50GB • Java framework	• Colors: Phantom Black, Silver, Titanium, Navy, Brown • Samsung Pay (Visa, MasterCard) • Samsung DeX • Stylus pen support
☢️ Radiation rate
	Galaxy K Zoom (4G SM-C115)	Galaxy S21 Ultra (SM-G998N 512GB)
SAR 1.6W/kg (USA, Mexico, etc.)	0.513W/kg (head), 1.074W/kg (body)	0.489W/kg (head), 1.1W/kg (body)
SAR 2W/kg (Europe, UK, etc.)	0.404W/kg (head), 0.369W/kg (body)	feature not registered