The highest display resolution of the Sony KD-49X8308 is 4K Ultra HD. That's over four times the display resolution of a Full HD TV, which is the most common display resolution. 4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
This television's display resolution (4K Ultra HD) is in fact the best display resolution across all mid-size TVs that have been on the market for a comparable time to the KD-49X8308.
The worst display resolution across comparable types of television is HD Ready.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
There are a number of alternative 4K Ultra HD televisions currently available that you might also want to consider including cheaper televisions such as the Samsung UE48JU6445, or the LG 40UF671 (£605.36).