I Am already on 5S but only because I already had one.
TO be honest, I think That Apple failed here. Not sure why.
with bigger screens and less space for backlight they should rather go to oled (which has no backlight at all).
But somehow they have decided to go to numbers instead of quality. To provide us with thiner phone still using lcd- sacryfing backlight uniforuniformity.
I Would not mind if iphone 6 would be half milimeter more thicker or £50 more expensive. half milimeter is not much for users but a lot more space from technology point of view. Just like £50 which is not really so much for users but it is really a lot from technology cost point of view.
so surprasingly they they have made a decision which was rather other brand specific- to go to numbers instead of quality.
I Don't think that half milimeter thicker phone will make Internet viewing less comfortable. But uniform backlight will definitely do as with iphone 6 I am simply disracted by by shadows thinking all the time that there is something on the screen that have to be cleaned.
SO I would say that iphone 6 is almost perfect phone.