The Samsung UE55J6289 has a maximum display resolution of Full HD. That's 75% less display resolution than a 4K Ultra HD television, 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.
Other Full HD TVs currently available that you might also want to consider include the LG 55LH545 which is cheaper.
If the display resolution of this TV is not high enough for you then you might want to consider the UN55KU6500 (4K Ultra HD), or the UE55KU6510 (£899.00) (4K Ultra HD) both from Samsung or the LG 60UH625 (£999.00) (4K Ultra HD).