I've owned this phone for just over a week, and while there are a couple of drawbacks, Nokia has put a great phone together with a solid spec list. If you're getting tired of iOS or Android (both great operating systems in their own right) then you should definitely give WP8 on the 920 a shot.

The only problem is that it's too hard to get a good feel for the 920/WP8 if the only way you can try the phone is in-store. You really need a couple of days to settle in and get the full picture of what the 920 has to offer.

Pros:
Screen is sharp and reproduces colours well
Wireless charging
32gb storage
Camara (especially in low-light)
1080p video with superb stability
Exclusives - Nokia Drive + other Nokia Apps
LTE
Great call reception/quality

Cons:
WP Marketplace is still maturing (although it now has most of the important apps)
Can feel a little weighty at first if coming from a smaller phone
No sd card slot