Are 4K TV resolution over kill

[Smokey]

That raises another point: DVDs certainly vary in quality. If they were all as good as they could be, I wouldn't care about BluRay at all.

After seeing few movies on BR and reading BR reviews, the same thing can be said about bluray movies. One rule of thumb might be that if a DVD got good reviews for its picture quality, there is good chance same movie look awesome on bluray.

I love the look of BR on a 4K tv.

I bet DVD doesn't looks too good on 4k TV since there is too much void for TV to fill in. For bluray movies on 4K, eye resolution and sitting distnace will also be factor, so it is a mix result.

Moving the sofa 4 feet from my screen is a good idea, then I can buy a smaller screen

If you are using TV as PC monitor, moving sofa closer might not be feasible. Most web sites use white background (like AR) and sitting too close make you go blind.

There's a much larger difference going 1080 to Ultra than I saw going from 480 to 1080.

If you take viewing distance out of factor, I believe the reverse will be more true