[Svartalfiar]

The biggest advantage 4K has over 1080p is the color depth/saturation. Blacks became incredible with 4K. I’ve also noticed a distinct improvement in eliminating motion blur. The resolution improvement was not truly apparent to my eyes upon upgrading to 4K.

Colors and blacks don't really have much to do with the resolution. Those will be other build factors in your TV. If you want really black blacks, the Kuro was one of the best. Plasma display. 720p if I remember correctly.

On a side note, were you actually running true 4k? Or did your source only output 1080, with the TV upscaling? In which case you aren't even running 4k, you're running a 4k display that has squares of 4 pixels for every actual pixel.

[KobraKai]

“Colors and blacks don’t really have much to do with the resolution. Those will be other build factors in your TV. If you want really black blacks, the Kuro was one of the best. Plasma display. 720p if I remember correctly.”

Color has everything to do with resolution. The more pixels there are, that means that the density of the color is higher per scan line. It also means that any particular color is more true. I operate a printing press by trade, and it’s generally the same theory.

“On a side note, were you actually running true 4k? Or did your source only output 1080, with the TV upscaling? In which case you aren’t even running 4k, you’re running a 4k display that has squares of 4 pixels for every actual pixel.”

I have an all Sony 4K HDTV setup, 4K BDP800, with plenty of 4K UHDs to have experience enough to back up my opinion.