Remember B&O didn't make the CRT tube it was a just a brought in tech from an aperture grille manufacturer ( I can't remember who they used).
The only thing which may set them above others is some of the later models did have a lot of useful picture setting options that the more mainstream TVs don't tend to have.
Actual picture quality isn't any better than a good Sony though.
If money is no option and you aren't an apple/B&O looks above performance fanboy, the best CRT you can buy is a Sony Broadcast CRT Monitor. They are bulky, casing won't look that nice, but the picture is the best. Expect to pay a lot, if you can find one.