Right now I have a Sony Inzone M9 I got when I bought my regular PS5. It's been good except for the sound when I don't feel like using headphones.
I think a more pertinent question here might be, what do you expect to get out of the new monitor? Obviously your budget for discretionary spending is comparatively high, since you're looking at a $1k~ monitor here. An Inzone M9 is already quite a good monitor. If you need a different size, or you feel like the darks aren't quite dark enough, and you're ok with spending that much for a slight improvement then you'll probably be happy with the Odyssey G8. It's a good monitor.
But, if you aren't in the small percent of people who are extremely discerning on image quality, you're probably not going to notice much of a difference. The 240hz refresh rate is a considerable upgrade if you have a top end PC capable of handling it, but a PS5 pro won't even consistantly max the 144hz your current monitor has.
Any strong feelings for OLED vs. UHD 4k
UHD is a resolution. Your current monitor is the same resolution, so both are UHD.
OLED is a technology. OLED monitors are set up so that each pixel can be individually dimmed, which results in far darker darks and greater contrast. It's great for illustrating dimly lit areas. It does allow burn-in, so should be careful about long term static images on it (there is technology like pixel shifting to help, but it still happens). OLED is generally considered the best lighting method.
Your current monitor uses full array local dimming, which means that the monitor's colors are lit by a series of backlights spread behind the image. This means that instead of each individual pixel producing it's own light, brightness is controlled by the backlight for a region of nearby pixels. The pixel sets the color, the backlight sets the brightness. This means that dimming effects cannot be localized to individual pixels.
QLED is a sidegrade that uses a sort of filtering on the backlight to produce brighter colors than full array local dimming, but also lacks dimming on a per-pixel basis. It does not burn in. I use a QLED TV personally, because I did not trust my gf not to burn in UI elements (she leaves games on it all the time). I can't say that I personally regret not going OLED, but I am not the most discerning viewer around.