I have returned two 65" EF9500s. The first had perfect, even blacks, but had uneven bright pink and blue patches that did affect the bright video color. I exchanged it and checked the new TV at the store for bright color uniformity, and it looked very good.
The first movie I watched on it when I got it home was Star Wars: the Force Awakens and I immediately saw massive lines in the dark video - very distracting. So I ran a 10% dark gray test on it and it had startling amounts of banding. So I returned it.
I will check the next one at the store both for bright and dark colors before I leave the store with it. Best Buy said they have a three-time return policy. I guess that by three times I will be frustrated enough that I won't really care, but this is awfully silly. I just can't figure out how to get a good TV in this market, something that works the way it's supposed to. I am temporarily watching an old CCFL direct-lit 40" LG TV that produces an excellent, even, uniform picture, with good colors. This TV is 10 years old.
Are those color imperfections something that owners just have to live with if they want OLED? My old 60" plasma blows this thing out of the water as far as quality and build. I just want a high-quality TV that works right. These manufacturers are not making it easy. You would think for for $5,000 that you would pretty much have a shoe-in. It makes me wish they would bring plasma back and just charge more for it.