Jgriff :
I have a 5s...moved to apple from android because the high end android phones are heavy and bulky for no reason, (excluding the moto x) but I didnt have the chance to grab one. Id be okay with larger screens as long as the form factor stays small and light for one handed operation, so a phone a TAD bigger than the 5s in both width and length, while still being under 4 grams and with a 5 inch screen that covers basically the whole thing, like a borderless design, thatd be perfect.
The bigger the phones are, the bulkier (and sometimes heavier) they'll be. It's just physics. You'll discover that Apple will have the same "problem".
4 grams? I would really love to see that phone.
Borderless design is good for some, but not all, and it favors 2-hand operation (stretching over the edge of the screen with one hand can trigger involuntary touch actions on said edge). Esp. for someone with small hands.