Compare Microsoft Lumia 640 XL Dual SIM vs Sony Xperia C4 Dual

Specifications
Key Specifications
Display Size 5.7 inches 5.5 inches
Operating System Microsoft Windows Phone 8.1 with Lumia Denim Android 5.0 (Lollipop), upgradable to 6.0 (Marshmallow)
RAM 1 GB RAM 2 GB RAM
Rear Camera 13 MP 13 MP
Battery Capacity Li-Ion 3000 mAh battery Non-removable Li-Ion 2600 mAh battery
General Features
Release Date 2015, March 2015, May
SIM Support Dual SIM (Micro-SIM, dual stand-by) Dual SIM (Nano-SIM, dual stand-by)
Phone Dimensions 6.22 x 3.21 x 0.35 in 5.92 x 3.05 x 0.31 in
Phone Weight 171 g 147 g
Operating System Microsoft Windows Phone 8.1 with Lumia Denim Android 5.0 (Lollipop), upgradable to 6.0 (Marshmallow)
Display
Screen Size 5.7 inches 5.5 inches
Screen Resolution 720 x 1280 pixels 1080 x 1920 pixels
Screen Type IPS LCD capacitive touchscreen, 16M colors IPS LCD capacitive touchscreen, 16M colors
Screen Protection Corning Gorilla Glass 3 Scratch-resistant
Memory
Internal Memory 8 GB 16 GB
RAM 1 GB RAM 2 GB RAM
Card Slot microSD, up to 128 GB microSD, up to 256 GB (dedicated slot)
Performance
Processor Quad-core 1.2 GHz Cortex-A7 Octa-core 1.7 GHz Cortex-A53
GPU Adreno 305 Mali-T760MP2
Battery
Type Li-Ion 3000 mAh battery Non-removable Li-Ion 2600 mAh battery
Camera
Front Camera 5 MP 5 MP
Front Flash Light No Yes
Front Video Recording Yes 720p
Back Flash Light Yes Yes
Back Camera 13 MP 13 MP
Back Video Recording Yes 1080p, HDR
Connectivity
Bluetooth Yes Yes
3G Yes Yes
4G/LTE Yes Yes
Radio FM radio FM radio, RDS
WiFi Yes Yes
NFC Yes Yes