The UN55F9000 has a maximum display resolution of 4K Ultra HD. That's over four times the display resolution of a Full HD television, which is the most frequently found display resolution. 4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
A 4K Ultra HD HD type is in fact the best display resolution across all large TVs that were released around the same time as the UN55F9000.
The worst display resolution across similar types of TV is Full HD.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.