The quality of the lens is key. 8 bits of dynamic range per color is more than enough. That’s 256 levels per color.
My DSLR camera has 14 bits. Having a high dynamic range is useful in capturing a scene with both bright and dark elements. The new 4K-HDR TVs have more pixels, but they also have 10 to 12 bits of color depth (versus 8 for standard HDTV).