The UE50J5105 has a maximum display resolution of 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.
Alternative Full HD TVs currently available which you might also want to look at include the 55PFT5500, or the 50PFT6510 both from Philips which is cheaper.
If you would prefer a TV with a higher display resolution then you might also want to consider the Philips 55PUT6400 (£529.00) (4K Ultra HD and cheaper) or the LG 55UF770 (£699.00) (4K Ultra HD and higher rated).