And so after more than half a decade since my last post, I think I have finally decided on the new monitor. I was using Samsung U28E590D both at home and at my office - it is a 28" 4K display with standard 60hz refresh rate. Back in 2022 I upgraded my office monitor to a Dell P3222QE. Very awesome display, 32" with very high quality image display, but still 60hz refresh rate. It doesn't matter because I don't watch movies or play games - mostly CAD and MS Office work. But at home I was still using my trust old U28E590D.
Well, today I just ordered a new monitor for my home PC, Asus ROG PG42UQ. Its a 42" OLED display with 4k resolution and up to 138hz refresh rate, and it seems to click all the boxes from my original post. Not sure if it will allow 4k @ 120hz with 10bit HDR without compression, but it seems HDR is still not a very mature tech, so I probably wont be using it. I intend on setting the refresh rate to 120hz, if my Quadro P4000 video card allows. It has no HDMI port, but four DP 1.4 ports, according to specs it supports 4k @ 120hz, and mentions HDR support. I may consider upgrading the video card to the RTX 4000ADA.
I also upgraded my wife's office PC as well. She was also using an old U28E590D, I upgraded her to a LG 40WP95C-W.AUS - its a 40" ultrawide display with 5k resolution and up to 72hz refresh rate. Not as fancy as my new OLED display, but she only does MS office work, so she doesn't need any of the advanced features, she just needed more screen real estate. I set her new screen to 60hz, because I'm worried at 72hz she may be getting frame tearing when watching youtube videos, most of which are 30/60fps?