Hello,
I've switched from the iPhone 6 to the Fairphone 5. Of course it's bigger, I already thought the iPhone 6 was too big compared to the 4 ^^'.
In the end, it doesn't bother me any more, the most annoying thing is using it with one hand to click in a corner (there's a "One-handed mode" option that reduces the screen size if necessary). On the other hand, given its size, I'm more likely to use it instead of a tablet or even a computer to watch videos or surf the web.

you get used to bigger phones, and in fact watching stuff is much nicer on a bigger screen.... And as mentioned there is a "one hand mode" (you can swipe down at the bottom of the screen which make the usable screen half the size for clickin on the top)