Display:
Higher contrast ratio than any other previous iPhone
Dual-domain pixels for wider viewing angles and more accurate colors
Improved polarizer so you get a better view when viewing through sunglasses.
Display Zoom: lets you see all your content even bigger.
Reachability: Double Touch the home button and the entire screen shifts down closer to the thumb.
Chips: A8 chip w/ M8 motion coprocessor
iSight Camera: Improved Face Detection, Panorama up to 43 Megapixels and Unique to iPhone 6 Plus Optical Image Stabilization
Video Recording: 30 fps or 60 fps, Slo-mo Video (120 fps or 240 fps), Time Laps Videos, Continuous Autofocus Video, Improved Face Detection, and Cinematic video stabilization to keep your shots steady when you can’t be.
FaceTime Camera: f/2.2 aperture enables faster autofocus, Auto HDR for photos and Videos,
Improved Face Detection, Burst mode: 10 photos per second, Timer mode
Apple Pay: Pay with your iPhone using Touch ID in stores and in apps.
Cellular and Wireless: NFC
Video Calling: FaceTime over Cellular uses H.264/H.265
Audio Calling: Voice over LTE, Voice over WiFi when you don’t have a good cellular signal,
Calls switch seamlessly from Voice of WiFi to Voice over LTE as service availability changes without interruption.
Power and Battery:
Talk time: 6 Plus up to 24 hours on 3g 6 up to 14 hours on 3G
Standby Time: 6 Plus up to 16 days 6 up to 10 days
Internet use: 6 Plus up to 12 hours on 3G, LTE, WiFi 6 up to 10 hours on 3G, LTE, up to 11 hours on WiFi
Video playback: 6 Plus up to 14 hours 6 up to 11 hours
Audio Playback: 6 Plus up to 80 hours 6 up to 50 hours
Sensors: Barometer