I hace Z500 and a video quality is very good when playing back MPEG4 movies - it's post processing is excellent .
However, while I do not had OPPO I know they use best upscaling chip available, while it might do less good job on MPEG4 playback it can't be beaten when upscaling to higher resolution.
About Z500 - there is a talk on Zensonic forums that actually Z500 does not so good job when upscaling thru HDMI, even worse then some modern TVs - that's why some people ask for "pass-thru" mode.
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I am not vindictive - I am just evil and have a good memory
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