Watched Frozen Planet on DiscoveryHD last night...IIRC, it's latest in the "Planet Earth" series.
Anyway, jaw-droppingly STUNNING on my 632 with Jason's latest Movie mode settings (I have Active Contrast ON, with the Gamma at -1, per Jason's direction). I mean, my fiance' and I were sitting there with our mouths open staring at the picture!! I have always been impressed with the PQ on this thing, but last night just blew me away...and that was after the season finale of The Walking Dead, which also ROCKS on this thing!!
FWIW, my source is a Cox HD STB connected to the panel via Component. I prefer Component over HDMI for non-1080p content. I run the sound through my Samsung 5.1 HTIB system via Toslink optical.
I just don't get how people are having issues with this panel...YMMV, I guess...