The highest display resolution of the UE55H6800 is Full HD. That's 75% less display resolution than the most frequently found HD type of 4K Ultra HD. Full HD TVs have a resolution of 1920 x 1080 pixels.
Full HD TVs have a resolution of 1920 x 1080 pixels.
It may also be worth also looking at one of the alternative Full HD televisions currently available including because of it's better review score, the LG 55EC930 (£1,299.00), or the Sony KDL-65W855 (£999.00).
If the display resolution of this television is not high enough for you then you might also want to consider the LG 55UF850 (£1,349.99) (4K Ultra HD and cheaper); or the Samsung UE55JU7500 (£799.00) (4K Ultra HD and higher rated).