Xiaomi
Xiaomi Mi 4i

Xiaomi
Xiaomi Redmi 2

Features
gyro, barometer, proximity, Compass, Accelerometer, - Fast battery charging (Quick Charge 2.0)
Accelerometer, gyro, proximity, compass, - Fast battery charging: 40% in 60 min (Quick Charge)
Accelerometer, gyro, proximity, compass
Memory
TIdak, 16/64 GB,, 3 GB RAM
No, 16 / 32 GB, 2 GB RAM
1GB RAM, 2GB RAM, microSD, up to 32 GB (dedicated slot), 8 GB, 1 GB RAM, 16 GB, 2 GB RAM
Display
Corning Gorilla Glass 3, 1080 x 1920 pixels, 16:9 ratio (~386 ppi density), 16M colors, IPS LCD capacitive touchscreen, 89.6 cm2 (~74.4% screen-to-body ratio), 5.7 inches
Corning scratch-resistant glass, 1080 x 1920 pixels, 16:9 ratio (~441 ppi density), IPS LCD Capacitive Touchscreen, 16M Colors, 5.0 inches, 68.9 cm2 (~71.7% screen-to-body ratio)
Corning Gorilla Glass 2, 720 x 1280 pixels, 16:9 ratio (~312 ppi density), IPS LCD Capacitive Touchscreen, 16M Colors, 4.7 inches, 60.9 cm2 (~67.6% screen-to-body ratio)
Battery
Fast charging 18W, Quick Charge 2.0, Li-Ion 3000 mAh, non-removable
Up to 35 h (3G), Non-removable Li-Ion 3120 mAh battery
Removable Li-Po 2200 mAh battery
Selfie Camera
f/2.0, 2µm, 4 MP, 1/3", 1080p@30fps
5 MP, f/1.8
20 MP, 720p
Main Camera
2160p@30fps, 1080p@30fps, HDR, Dual-LED dual-tone flash, Panorama, AF, OIS, f/2.0, 13 MP
1080p@30fps, 480p@120fps, Dual-LED dual-tone flash, panorama, HDR, 13 MP, AF, f/2.0
1080p@30fps, LED flash, HDR, 8 MP, f/2.2, 28mm (wide), 1/3.2", 1.4µm, AF