@DrewDad,
Dunno. Ours (it's a little embarassing, really), is a Sony Bravia, so toward the higher end of the spectrum, and I've got no complaints, and I don't watch any Hi-Def on it. I have spent some time customizing the picture for a noise/softness compromise that I'm happy with.
I've got bigger beefs about what TiVo does to the picture quality (but, hey, no commercials, watch when you want).