The highest display resolution of the UE55K6379 is Full HD. That's 75% less display resolution than a 4K Ultra HD TV, which is the most common display resolution. Full HD TVs have a resolution of 1920 x 1080 pixels.
Full HD TVs have a resolution of 1920 x 1080 pixels.
If the display resolution of this TV is too low for you then you might also want to consider the Samsung UE65KU6000 (£999.97) (4K Ultra HD and higher rated).