The quality of a TVs internal processing will have a major influence on the picture quality,especially of SD material.
Otherwise,why would one have need of expensive external processors such as Lumagen?
Not really. I think you miss the point. I mean that LCDs tend to show the picture "as is" in all their glory or pixelated when the quality is poor. When you get a very powerful source, a top notch Samsung LCD will be as good as, say, a BV10-46. I was back up North at Christmas and my Mum's new Samsung is pretty damned impressive with a HD source. I hardly can tell any difference.
What I'm trying to say is that if you get a great source - say HD - then the difference between good TVs is minimal. ie. I watched her new Samsung at Christmas, got back and viewed by new BV10-46 and thought "there's no difference!".
However get an SD picture and the Samsung is definitely more pixelated and, of course, the sound was terrible. Even the BV10's audio is much better than the Samsung.
If you look at the original question, the poster was asking whether there's going to be any new panel changes coming soon and whether it's worth waiting. What I'm trying to say is that the changes will be very very minimal. It's the source for the picture that will make much more of a difference. There's a HUGE difference watching SD on an LCD compared to HD!