I confirm what @douwe is saying - Katies head is quite small, haha. And next to that she's holding the phone at the very bottom, which makes the phone seem longer too. But if there is high enough demand, I'll recreate this photo with someone with a more regular sized head
Seriously though, I agree with @Ed_Bycroft that the Verge's article is a good one for reference.
And, I was also a bit worried about the big size at first. But it fits in my pocket just fine and I got used to the bigger size pretty quickly.