The problem with most of those monitors is they're from podunk Korean companies.
The new Xiaomi 4k 49" tv (Samsung panel) is supposed to have 4:4:4 for ~$500 retail but only available in china. Xiaomi quality is generally pretty good.
Of the current TV's, the samsungs are good but the lower strata <=7000, eg 6700/6500 have questionable backlight PWM for desktop use.
The new Xiaomi 4k 49" tv (Samsung panel) is supposed to have 4:4:4 for ~$500 retail but only available in china. Xiaomi quality is generally pretty good.
Of the current TV's, the samsungs are good but the lower strata <=7000, eg 6700/6500 have questionable backlight PWM for desktop use.