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Originally Posted by JCM
Now as I understand it, this DVD player puts out 480 interlaced lines, which my Hitachi upconverts to 1080 interlaced lines..
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I don't believe you Hitachi upconverts the DVD to 1080i but rather to 480i or perhaps 480p. The reason is the Hitachi is CRT based and produces the vertical scan frequency it given. There are some DVD players that upconvert their 480p to 1080i because of its own scan converter. The 811 is sending 1080i all the time and upconverts lower formats (assuming you're using the component/DVI outputs).
But to answer your question, you'll find with all video sources (HD/SD/DVD) the PQ varies because of the original quality of the source material. This is beyond your control and your equiment is not to blame. I have some DVDs that have lousy picture and sound while other are superior and appear closer to HD. It's all from where the manufacturer or broadcaster obtained the source material. The best recommendation is choose movies that are newer releases, also recommend buying DVDs that are in the widescreen format as they're more likely truely displayed in 720x480 (without upconversion). Also movies that have very long playing times (on a given DVD) may apply more compression than normal length movies. Greater compression may display more digital artifacts, less color range or lower resolution in some cases.