The 55UB850 has a maximum display resolution of 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.
This television's display resolution (4K Ultra HD) is in fact the best display resolution across all televisions that are a comparable age to the 55UB850.
The worst display resolution amongst comparable types of television is Full HD.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.