It has 3D touch. 12MP back camera, 5 MP front camera, Co-processor, 2GB RAM everything from inside is changed which makes it the fastest iPhone(of course, now iPhone 7 is in the market).
Pros:
1) The user interface is very beautiful and easy to use. It is not as complicated as Android.
2) 3D touch is amazing just you need to get used to it.
3) Camera is also very nice. The pictures look more crisp and realistic. And Live photo feature is just wow. Though it consumes a lot of space.
4) The processor output is like very nice. I am using this phone from past 3 months but I didn’t notice any lag as such.
5) The operating system is very much reliable and easy to use.
6) Now 32 GB variant is also available and its a Thumbs up.
7) This has 5.5 inch screen size and a larger battery.
Cons:
1) The cost is very high when compared to the competitors I guess that is just brand value.
2) The features are not that much when compared to Android devices as it is not highly customizable.