I agree that is the only difference i can see. foudn this on http://4k.com/the-ultimate-guide-to-the-new-4k-tvs-of-2016-from-samsung-to-lg-sony-and-vizio-14496-2/
"However, the difference between 8 bits and 10 bits is enormous, with 8-bit color allowing for a total of only 16.8 million color mixes and only 257 possibly values for any one of the primary digital display colors –Red Green and Blue (RGB). While this sounds enormous, 10-bit color allows for just over 1 billion different colors and 1024 different values for any of the RGB colors. In other words, a 4K TV with 10-bit color offers a much more refined, smoother gradation between color variations, and the effect in 4K TV display can be spectacular to behold, especially as far as realism and vibrancy are concerned."