Sorry lads, but all those talks about "huge huge difference" between iPhone 6 and 6s making me laught 🙂 I bought pink one (6s) for my wife (because she was using 5s) and i'm still using my first gen 6. Difference in real life scenarios - from small ones to no difference. Yes, i'm not a hard user, i'm not playing games at all and so on, but i don't have any good reasons to upgrade this year. Design is the same, battery life - the same, camera - the same (yep, i don't need 4k, because everytime i'm using 1080p 60fps), 3D touch - will be great next gen trick (when most developers will add it to their apps), live photos - sorry, i'm not 16 already 😀
Is it big upgrade for 5s user - hell yeah, for 6 - nop, just nop 🙂