for the 3D touch, people might think they don't need it... but end up they cannot leave without it...
When they introducing Touch ID, iPhone 5 user said its just a touch ID, i can use passcode to unlock, so why upgrade? But once you used the 5S, you feeling weird when you want to unlock your iPad Air using passcode...
For the SIRI, yeah its nothing really make you WOW, but its help me to make a call to my mom or my gf when i were driving....
3D touch, i haven't use it, so i have no comment, but i am sure.... end up without 3D touch, you feel like lacking of something...
ops, people may labels me as iFags, but its okay, i am proud of it

btw, tonight Apple gonna announced how well they sell over pre-order. I'm guessing 12-13mil. an increase of 2-3mil sales over last year Iphone 6 & 6+