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There is a HUGE difference on my DISH system on the plasma, but I am getting the four major networks in HD. What I would like to see is some of the other channels in HD on DISH like SciFi, FX, and the WB, err the CW
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I have flipped back and forth between the hidef / regular signal on channels like TNT that have both and haven't seen a lot of difference in image quality. The image on the plasma I have is so good that everything looks great.
As to sci fi and some of the other channels, and what I have seen... one of the big factors in how well that hd image looks is if the show was shot in HD with HDcams. It drives me nuts that hdmv shows old movies all the time that get zero benefit from being broadcast in that format.