The Samsung UE40KU6400 has a maximum display resolution of 8K Ultra HD. That's over thirty-six times the display resolution of the most frequently found HD type of HD Ready. 8K Ultra HD TVs have a resolution of 7680 x 4320 pixels.
An 8K Ultra HD HD type is actually the best display resolution amongst all recently released similar spec TVs.
An HD Ready HD type is the worst display resolution across comparable types of TV.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.