Yep. I got the M8 today and figured HDR, overall nicer monitor would be a decent upgrade from the HP 32Z I've been using so far. God was I wrong.
That VA Panel is awful! If you have a full-screen white website (e.g. macrumors) you can also see how the brightness tapers off at the bottom.
Also HDR only works via HDMI, not USB-C (plus macOS looks awful on this monitor when you switch on HDR).
Instant return, sadly.
I'll be sticking with the 32Z for now, not as fancy but at least it has an IPS Panel and uniform lighting.