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I've been reading about how DTV is not even broadcasting full HD anymore (they call it HD-Lite on AVS Forums)... See http://www.avsforum.com/avs-vb/showthread.php?t=704350 and http://www.engadgethd.com/2006/09/20/directv-gets-whats-comin-to-them/ - I still think that HD on DTV looks great, but not what it could be, apparantly.
Those screen shots they chose were bad examples, because the differences are so subtle. I could have found better examples. For instance, the biggest places I see compression problems are on scene transitions without keyframes. They could have chosen to do a framegrab right after a scene cut and it would have been a bunch of huge MPEG squares instead of a picture.
Most of the issues I see with data compression are best shown in motion, not in still frames. Like, there's something I've been seeing more and more lately with talking-head interviews. You know how, as someone talks, their head moves in subtle ways, even if they're trying to hold still for the camera? Well, what happens with overcompression is that the facial features move a lot, so they get updated, but the head's outline doesn't move much, so it doesn't get updated and just sits there frozen. So you get this not-subtle-at-all sensation that their face is sliding around in relation to their skull, as if their head is made of jell-o. Very very irritating, and it's one of the results of overcompression.
GOD I HATE VIDEO COMPRESSION. ARGH.
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