I think the lack of content could have been a factor.
I prefer samsung TVs as well, but did get a Bravia as an additional when they threw in a PS3 with the purchase. It's been awesome.
Sony bravias are great too, built like a brick shithouse.
Lack of content is definitely a factor. Plus, right now, you have to buy discs. I refused to go back to buying discs. Stream content sucks, I think Netflix has something around 4 4K movies.
I haven't made the jump to 4K yet, my next will be though just to future proof. I guess the big draw right now is gamers.