Well, I stopped by Best Buy this evening to see if they had any 8G Kuros left. I wanted to compare their noise to what I see on my 1150. They actually did have a 950 but it wasn't plugged in -- apparently they lost the power cord.
Since all the 2008 Kuros are 1080p and a generation newer, obviously the comparison isn't completely apt. As I expected, for the most part the Kuros on display were quite smooth. The 6020, however, had a lot of the same "dithering" effect that I see on my 1150. It was near a 700u (which I owned and hated), which looked much much cleaner.
I also found an old thread (http://www.avsforum.com/avs-vb/showthread.php?t=991844
) which describes *exactly* the same problem. Unfortunately, like that poster I think the noise is so horrible that I may have to get rid of the TV or call Pioneer and see if there truly is something wrong with it. With all the other posters on that thread seeing the same awful noise, I think it's almost certain that it's just an inherent flaw.
If only my room was big enough that I could move my couch 15+ feet away. Even at 11 feet the noise is quite distracting, especially on video content. You just don't get that "window" effect like you should on 60z sources. For film sources it's not as obvious.