Re: The 5C was different
I'm making no comment on Apple or Android here, and I'm mentioning my 4.7" Sony Xperia Z3 Compact purely in relation to the ergonomics of screen and phone size. The vendor and OS are irrelevant for this post. Okay:
I choose it because I didn't want a 5"+ phone. My job can be active, so a large flat slab in my pocket is uncomfortable (and probably not good for a larger phone, bending moments being what they are).
Holding the phone in my right hand hand, my thumb can reach 80% of the screen easily, and 100% at a slight stretch. Reaching the top left corner of a larger phone strains my hand, and compromises my grip of the handset.
Now, if my lifestyle was different (perhaps if I spent more time on public transport, or if I decided that bum bags or utility belts became me) or my hands were bigger, or my fingers fatter, or my eyesight poorer, I might consider a 5" phone. They are better for looking at images, definitely.
Summery: Choice is good.
Observation: Playing cards are a size that is easy to hold in the hand. Postcards are of a size that is easy to look at.