Asus Zenfone 4 Pro ZS551KL
#1219
Xiaomi Redmi K20
#1502Category Breakdown
Asus Zenfone 4 Pro ZS551KL
Xiaomi Redmi K20
Performance
80.277.4
Camera
94.667.3
Display
80.283.7
Battery
26.928.1
Build
80.595.7
Connectivity
67.964.3
Audio
71.58.9
Overall
61.557.7
Summary
- The Asus Zenfone 4 Pro ZS551KL features a 5.5-inch AMOLED display with a resolution of 1080 x 1920 pixels, while the Xiaomi Redmi K20 has a slightly larger 6.39-inch Super AMOLED display with a higher resolution of 1080 x 2340 pixels and HDR support.
- In terms of performance, the Zenfone is powered by the Snapdragon 835 chipset, offering superior processing capabilities compared to the Snapdragon 730 in the K20.
- The camera system on the K20 is more advanced, featuring a 48 MP main sensor alongside additional lenses, whereas the Zenfone has a dual-camera setup with a 12 MP main sensor.
- The K20 also has a larger 4000 mAh battery compared to the 3600 mAh in the Zenfone, both supporting 18W charging.
- Both devices have a premium build with glass and aluminum materials, but the Zenfone runs on an older Android version (7.1.1) with ZenUI, while the K20 offers a more recent Android 9.0 with MIUI, providing a potentially better software experience.
Side-by-side Specification Comparison
Asus Zenfone 4 Pro ZS551KL
Xiaomi Redmi K20
General
Release Date
2017
2019
Announced
2017
2019
Description
N/A
N/A
Display
Size
5.5"
6.39"
Type
AMOLED
Super AMOLED, HDR
Resolution
1080 x 1920 pixels, 16:9 ratio (~401 ppi density)
1080 x 2340 pixels, 19.5:9 ratio (~403 ppi density)
PPI
1080
1080
Refresh Rate
60Hz
60Hz
HDR Support
✗
✓
Protection
Corning Gorilla Glass 5
Corning Gorilla Glass 5
Performance
Chipset
Qualcomm MSM8998 Snapdragon 835 (10 nm)
Qualcomm SDM730 Snapdragon 730 (8 nm)
CPU
Octa-core (4x2.45 GHz Kryo & 4x1.9 GHz Kryo)
Octa-core (2x2.2 GHz Kryo 470 Gold & 6x1.8 GHz Kryo 470 Silver)
GPU
Adreno 540
Adreno 618
Memory
64GB 6GB RAM, 128GB 6GB RAM
64GB 6GB RAM, 128GB 6GB RAM, 256GB 8GB RAM
Expandable Storage
✗
✗
Card Slot
microSDXC (uses shared SIM slot)
No
Camera
Main Camera
12 MP, f/1.7, 25mm (wide), 1/2.55", 1.4µm, dual pixel PDAF, 4-axis OIS16 MP, 50mm (telephoto), 1/3.1", 1.0µm, AF, 2x optical zoom
48 MP, f/1.8, 26mm (wide), 1/2.0", 0.8µm, PDAF8 MP, f/2.4, 53mm (telephoto), 1/4.0", 1.12µm, PDAF, 2x optical zoom13 MP, f/2.4, 12mm (ultrawide), 1/3.1", 1.12µm
Main Camera Features
Laser AF, color spectrum sensor, LED flash, HDR, panorama
Dual-LED flash, HDR, panorama
Front Camera
8 MP, f/1.9, 22mm (wide), 1/3.2", 1.4µm, PDAF
Motorized pop-up 20 MP, f/2.2, (wide), 1/3.4", 0.8µm
Front Camera Features
HDR
HDR
Video Recording
4K@30fps, 1080p@30/60fps, 1080p@120fps, 720p@240fps
4K@30fps, 1080p@30/120/240fps, 1080p@960fps
Selfie Video
1080p@30fps
1080p@30fps
Optical Stabilization
✓
✗
Night Mode
✗
✗
Raw Photo Support
✗
✗
Battery
Capacity
3600 mAh
4000 mAh
Battery Details
Li-Ion 3600 mAh, non-removable
Li-Po 4000 mAh, non-removable
Charging Details
18W wired, 50% in 32 min
18W wired
Fast Charging
✗
✗
Wireless Charging
✗
✗
Build & Safety
Dimensions
156.9 x 75.6 x 7.6 mm (6.18 x 2.98 x 0.30 in)
156.7 x 74.3 x 8.8 mm (6.17 x 2.93 x 0.35 in)
Weight
175 g
191 g
Materials
Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), aluminum frame
Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), aluminum frame
Colors
Moonlight white, Pure Black
Carbon black, Red flame, Glacier blue, Pearl White
Foldable
✗
✗
SAR
N/A
1.07 W/kg (head) 0.72 W/kg (body)
Connectivity
SIM
Nano-SIM + Nano-SIM
Nano-SIM + Nano-SIM
Network
GSM / HSPA / LTE
GSM / HSPA / LTE
Network Speed
HSPA 42.2/5.76 Mbps, LTE (3CA) Cat12 600/150 or 100 Mbps
HSPA, LTE
5G
✗
✗
4G
✓
✓
WiFi
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Bluetooth
5.0, A2DP, EDR, LE, aptX
5.0, A2DP, LE, aptX HD
NFC
✓
✓
USB
USB Type-C 2.0, OTG
USB Type-C 2.0, OTG
IR Blaster
✗
✗
Headphone Jack
✓
✓
Radio
✗
✗
Positioning
GPS, GLONASS, BDS, GALILEO
GPS, GLONASS, GALILEO, BDS
Audio
Stereo Speakers
✗
✗
Loudspeaker
Yes, dual speakers
Yes
Audio Jack
Yes
Yes
Software & Security
Operating System
Android 7.1.1 (Nougat), upgradable to Android 8 (Oreo), ZenUI 4
Android 9.0 (Pie), upgradable to Android 10, MIUI 12
Fingerprint
✓
✓
Face Unlock
✗
✗
Sensors
Fingerprint (front-mounted), accelerometer, gyro, proximity, compass
Fingerprint (under display, optical), accelerometer, gyro, proximity, compass