When I threw up the image on DVI-HDMI connector @ 1920x1080 the image did NOT look as good as my wife's lappy (using RGB connection) @ 1400x1050. It was also overscanned to about 1 inch all around past the screen edge.
I'm running an NVIDIA 7800GT, not that that should matter except in tweaking utilities (nvidia vs ati control panels).
The reason it doesnt look good and have overscanning is because you need to change the setting on the TV to use full pixel mode. This turns on the 1:1 pixel mapping and every single dot will be pixel perfect/razor sharp. You should check out the AVS Forum thread for getting the colors calibrated perfectly here: