I bought the BenQ PD3226G after some research and it seems good so far. I have used it for a week now.
It's a true 10-Bit 4K 144HZ IPS display for about ~1000 Euro.
This thread according to title is about 8-bit monitors, but it seems to have evolved into the go to list for save monitors in general, so maybe my experience helps someone who is looking for a more premium monitor.
I have set contrast all the way down, color mode to sRGB, Low blue Light to 2 and color temperature to 5000K, which makes it a little more comfortable. I use it at 120HZ.