The highest display resolution of the 43UH664 is 4K Ultra HD. That's over four times the display resolution of the most common HD type of Full HD. 4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
A 4K Ultra HD HD type is actually the best display resolution amongst all mid-size TVs that are a comparable age to the 43UH664.
Amongst similar types of TV the worst display resolution is HD Ready.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
There are a number of other 4K Ultra HD TVs currently available which you might want to look at including cheaper TVs such as the UE49KU6100[pl_3539678_price], or the UE40KU6100[pl_3539700_price] both from Samsung.