Just bought a UHD 4k set and streamed Blacklist and Marco Polo. The difference is without a doubt noticeable. It took a while to get used to the difference and it is almost uncomfortable to watch in comparison to 1080p. Although agreeably subtle, takes that much more of the "je ne sais quoi glow" from the older specs. Maybe the previous posters need to make some appointments with the optometrist?