Vassillios, I dont own that DVD and dont know if that causes your issue. According to this article

http://hdguru.com/?p=187

lack of inverse telecine can cause loss of resolution or motion artifacts. So if what you are describing is motion artifacting then it may be.

As for the SD, I think some SD is worse than others. I was watching a women's tennis match on an A2000 in SD when they came out and the fact that I almost didnt want to watch Sharapova vs. Dokic match made me keep looking.

I have seen other SD broadcasts that look better on that set as well. The fact seemed to be it handles good programming well, but bad programming worse than other sets.