Spent a bit more time with the 55". I tweaked it as best I could with AVS709 ('cause I'm not spend hours calibrating the one at work with HCFR when all customers want is everything set to Vivid anyway) and watched a bit more content. I just wanna reiterate that the 3D is incredible, and the 2D line structure is very tolerable at about 100 inches distance. Watched a few more upscaled Blu-rays, and I'm still very impressed. Lawrence of Arabia looked superb, it's just so clean and detailed. It's almost hypnotic, watching such a richly detailed image.
I even put on a few DVDs, which revealed some odd cross-hatching over things like text. I think that's because it's being upscaled twice over, i.e. once in the player to 1080 and then again in the TV to 2160, and areas of sharp convergence tend to suffer a little. I'll have to try it sometime with inputting a 480i/576i DVD signal directly, no in-player upscaling, and see what the TV thinks of them apples. Still not looking forward to running my laserdiscs through it.
As for viewing angle on 3D, side to side viewing is fine but it does drop off when the vertical angle is compromised, as someone said earlier in the thread. If your eyes are level with any part of the viewable image, it's okay (dead centre being best, natch) but if your viewing position is above or below the actual screen then you'll be getting some crosstalk, yessir. Wall mounting is NOT advised.