Got the iPhone 6 last Feb.
Off the bat, slightly (slightly lang) better battery life, two charges na lang instead of three. Pagkauwi ko sa bahay mga kalahati pa, dati sagad na ng 20%
The screen is great, sharp, colors aren't oversaturated (I'm looking at you Samsung). Too big for my taste though (small hands, short fingers). I do appreciate the screen real estate though.
The body is slim, sleek, a great device to hold. For a really thin device, it feels solid, compared to other phones made of plastic which feel that they have much more "give." Bonus points for the thinness: even with a jelly case on, it's still thinner than my old iPhone 5 without a case!
The home button seems like it's more sturdy, and it should be, because its main features (NFC, Apple Pay) depends a lot on the fingerprint scanner.
I hate the rubber lining at the back.
While the device itself is really sleek, it's not sleek enough. The protruding camera lens is the feature that sticks out, literally. Luckily for me the case I got is thick enough to sit flush with the height of the camera lens, but any thicker and the phone becomes too unwieldy (IMO).