No, I'm saying that the difference will wary depending if the HDTV will do the scaling or the PS3.
Some HDTV are simply better at upscaling than other (older, cheaper) HDTVs. So if your HDTV allready has a great scaler, the difference will be minor.
This has nothing to do with if the HDTV is 720p or 1080p native.
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