I can barely tell the difference between 4K and upconverted HD and I sit 5’ from a 65” OLED monitor and watch fully uncompressed video all day in my edit suite. But I just do it for a living on gear that costs $30,000+, so what do I know.Uh, so no one can tell the difference between HD and 4K regardless? That’s kind of ironic.
Bet the marketing folks at Sony have an answer though.