I have a 65" Mits, and first of all, this screen is a whole heck of a lot larger then any 52" screen, much much larger. As for PQ, once you have it callibrated, it produces a very nice picture, especially considering the price. LCD's probably show better on a showroom floor because they are brighter, but once you get it home, you are going to want to turn the brightness down anyway. Viewing angles, of course, are not as good on DLP's. If this is important than go with the Mits. over those Sammy LED's.
I know what you are saying though. I tossed and turned over this one before I took the plunge into DLP. The bottom line is that for screen sizes 65" or larger, there are no other affordable options.