A local store (American) just got the 52B630 in yesterday, so I was finally able to look at one. I currently have a 4661 (about 2 years old, matte screen, only 10 or 20k CR, but unless I'm comparing it, I still like the pic).
1. The matte/anti-glare on the 4661 is much better than the new 630. On a scale of 1-10 with 10 being best (can't see any trace of light on the screen), the 4661 is about an 8. Yes, I can still see some "blobs" of light on the screen (several large windows) when it's turned off, but very vague; don't see any reflections in any kind of scene when TV is on. The 52B630 is about a 4. I can see much more reflection, but in comparison to the ultra-clear screens on either side of it in the store, it is definitely better. I think I'll be able to live with it (and if I decide the glare will require blackout curtains on the windows, then I'm going up to the 55" LED model; WOW, what a picture, 3 or 5 MILLION CR, and very thin too).
2. Color and CR: I can't believe anyone would be disappointed. Very nice. Much better than my 4661. I suppose if you put it next to one of the new LED models, and you can't live without the absolute top of the line, and money is no object . . . .
3. Viewing angle: I hit the still button on my 4661 and took a good look at blacks, whites, and colors, from R to L, and top to bottom, before I went to the store. The picture on mine is fine way off axis, but at 20-30 degrees, blacks and colors lose a lot, washing out. The store was closing and the guy couldn't figure out how to take a still pic (is there one on the B630?), so it was difficult to tell, but it sure looked a lot better off axis than my 4661.
Unless the bottom falls out of the price on the A630 in the next couple of weeks, I'm leaning more and more toward the B. I still think it's strange Sammy has not listed it on their site . . . .