My review so far:
First the shape - While bearable, the sharp edges makes it a lot more uncomfortable than the 920 and it goes from being natural in your hand to somewhat uncomfortable. This sensation gets worse as you use the phone and the insides get hot. Instead of placing the parts that overheat at the top (as in the 920) or not overheat at all (as it should be), this phone burns right where you hold your hand which makes it almost painful, and a bad idea for extended use. This situation worsens even more when you try to play some music and you realize that the speaker is placed just where you hold your hand and all sound all but disappears when you try to let it rest in your hand, forcing you to bend your hand around the speaker uncomfortably to get sound from it. As you now hold it somewhat unbalanced you are prone to still bump Into the speaker once in a while making the sound flicker. If you want to listen to music while using this phone you should use a headset (earbuds not included with phone, buy some).
As for size, its length makes it too big for one handed use. Using the higher resolution I could use my old layout of buttons on start screen and still reach everything, but it leaves a black no-buttons-land on the right side of phone (I use phone in left hand) that I can't use that I will look to fill up with fake icons later so it looks better.
Performance wise, I can't say I notice a big change from the 920. I guess it should faster, and it probably is, but its subtle.
So why should you get this phone instead of a 920? To be honest I only see one thing going for this phone and that is the screen. It is much better than the 920, and a pleasure to look at. It comes at a hefty price though, as it no longer supports the glance screen which is both really useful and a big part of making it feel like your personal phone.
Conclusion: I bought this phone because my 920 has started rebooting and getting problems. Holding it now is not a sense of an upgrade, but a downgrade which is a terrible review for a phone that comes out from the same company years later. All the careful thought that wad made in the design seems to have been all but forgotten and replaced with a design that is not only less comfortable, but actually unforgivably stupid at times. If you still have a working 920, stick to it - If you don't, see if you can find one cheap and try it out. Chances are you will. find it the better choice.