The highest display resolution of the 40UB8000 is 4K Ultra HD. That's over four times the display resolution of the most common HD type of Full HD. 4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
A 4K Ultra HD HD type is actually the best display resolution amongst all mid-size TVs that came out around the same time as the 40UB8000.
The worst display resolution amongst comparable types of television is HD Ready.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.