I can second this. I bought two of the 5K 27" ProArt monitors plus a Thunderbolt hub to be my home setup, all for less than the price of one Studio Display, and it has been working perfectly.
That was the one I'd heard of, but I was shocked to see how low the Amazon reviews are (3.8). A highly-rated review said it had horrible clarity, like a greasy phone screen.
As someone who is _very_ sensitive to screen texture (cannot tolerate grain, own glossy Dough Spectrum 27" 4k for that reason), from what I gathered, yes newest 5k and 6k panels use unusually harsh coating, which I am certain I would not be able to use whatsoever.