The Sony KDL-50W808 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.
There are a number of other Full HD TVs currently available which you might also want to look at including the UE50J5105, or the UE55J5100 (£599.00) both from Samsung or the LG 55LF5610 (£599.00) which is cheaper.
If the display resolution of this TV is not high enough for you then you might also want to look at the LG 55UF770 (£699.00) (4K Ultra HD) which also has a higher Rating.