The Xiaomi Mi 4 is the 2015 model while the Xiaomi Mi 5 is the 2016 model, both devices are high-end devices coming into the market cheap. The latter is the latest flagship device of the company, and comes in two variants; the Pro and the standard. The Mi 5 comes in 10 grams lighter than the Mi 4, and is also significantly thinner than the Mi 4 at 7.2mm versus the Mi 4’s 8.9mm thickness. Both devices come in black or white, but the Mi 5 also has a gold option.
The Mi 5 varies again with the Mi 4 with a slightly larger display at 5.2 inches compared to the Mi 4’s 5.0-inch display. But a common factor with both displays is the same 1920×1080 resolution that the Mi 4’s display has, is also available on the Mi 5. This is disappointing because the Mi 5's screen is a bit larger, it means its display actually has a lower ppi at 428 versus the Mi 4’s 441 ppi.
Another somewhat disturbing one for the Xiaomi Mi 5, is that it's younger brother, Mi 4, features a better selfie camera than it. There's a 8 MP front camera available in the Mi 4, and a 5 MP one in the Mi 5. But there's a remarkable upgrade in the Mi 5's primary camera at 16 MP compared to the Mi 4's 12 MP. The Xiaomi Mi 5 comes with a little downgraded battery pack, 3000 mAh unit. And the Mi 4 is powered by a 3080 mAh unit.
Anyway, the Xiaomi Mi 5 has a much faster processor, more RAM, and has a higher top-level storage option. It is body and design has a sexier glass or ceramic upgrade over the old plastic Mi 4. The Xiaomi Mi 5 is still the better of the two
Mi 5 Specs
Display
Type – IPS LCD capacitive touchscreen, 16M colors
Resolution – 1080 x 1920 pixels
Size – 5.15 inches
Body
Dimensions – 144.6 x 69.2 x 7.3 mm
Weight – 129g
SIM – Dual SIM (Nano-SIM, dual stand-by)
Memory & Platform
Internal Storage – 128 GB
Memory Slot – None
RAM – 4 GB
OS – Android OS, v6.0 (Marshmallow)
CPU – Quad-core (2×1.8 GHz Kryo & 2×1.36 GHz Kryo)
Camera
Rear Camera – 16 MP, f/2.0, phase detection autofocus, OIS (4-axis), dual-LED (dual tone) flash
Front Camera – 4 MP, f/2.0, 1/3" sensor size, 2µm pixel size, 1080p@30fps
Connectivity
Wifi – 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA, hotspot
Bluetooth – v4.2, A2DP, LE
USB – Type-C 1.0 reversible connector
Battery
Non-removable Li-Po 3000 mAh battery
Mi 4 Specs
Display
Type – IPS LCD capacitive touchscreen, 16M colors
Resolution – 1080 x 1920 pixels
Size – 5.0 inches
Body
Dimensions – 139.2 x 68.5 x 8.9 mm
Weight – 149g
SIM – Micro SIM
Memory & Platform
Internal Storage – 32/64 GB
Memory Slot – None
RAM – 3 GB
OS – Android OS, v4.4.3 (KitKat), upgradable to v6.0.1 (Marshmallow)
CPU – Quad-core 2.5 GHz Krait 400
Camera
Rear Camera – 13 MP, f/1.8, autofocus, LED flash
Front Camera – 8 MP, f/1.8, 1080p@30fps
Connectivity
Wifi – 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA, hotspot
Bluetooth – v4.0, A2DP
USB – microUSB v2.0, USB Host
Battery
Non-removable Li-Ion 3080 mAh battery