The first two of those actually look really great on UHD, shows up the level of craftsmanship on Hendersons design work. I think it helps that for alot of stuff I didnt upgrade from DVD to BR so its a jump from DVD to UHD now which makes rebuying easier to take although I suspect there is going to be a lot of stuff were we never see UHD's, I suspect it will end up being mostly either fairly big films or cult genre films, especially horror.
Quality, extras and packaging is definitely a very large part of why I still buy but also I admit I just don't like the rental model, its ok for casual watching, I watch plenty of stuff in Amazon prime and sometimes Disney/Netflix for awhile but for films I really love having it on the shelf knowing I'm not at the mercy of some companies shifting marketing tactics feels much better.