I can only speak for myself: I "only" own an 32" TV..so not really big. It's not even Full HD, just 720p. But as I said before: In the old version (1.15.05) everything was fine. The images looked exactly as they look in the XMB (if you select the game and the background changes). But now it seems that they are being sized down and then stretched big again.
Anyway! Thanks again for taking care of that