Toyed around a little today with several WP8 devices.
Lumia 820: Suprised that I liked it that much in person. I feel that the very basic formfactor and relatively small bezel work well for a mid-range phone a little too expensive though . Screen looked great, even though the resolution could be better.
Lumia 920: Hot device. Feels fantastic in your hands, like a great quality product. Dont know where the OMG HEAVY stuff comes from. Screen felt a little too big for me, since I am only used to using my 4" Omnia 7, so that would need some readjusting but the resolution is fantastic and the curved glass makes it look a lot better than 900. Dislike the huge bezel at the bottom though.
HTC 8x: Feels much much slimmer than 920, probably because of the curved back. The phone did feel a little cheaper, but it still is one of the best looking devices out there atm.
This was the first time I ever used Windows Phone 8 and the fake profiles in demo units work great, felt very natural moving around in the OS and I did not mind the new start screen at all, as I thought I would.