@Jubei: Can you try heading to Settings > Display > Extra Brightness (On) > Adaptive Brightness (Off), to see if you notice an improvement?
I have the same issue, I have an Exynoss S22 Ultra and an S21 Ultra here, and the S21 is much, much brighter in any use case. Pictures, Ui all have a significantly lower brightness on the new device.
And than the brightness gets really super super low on the S22 Ultra when playing Video Content, especially with HDR. It gets so dark that you almost can't see anything in dark scenes - for example in the Witcher Series on Netflix. On YouTube it's the same.
The settings are manual Brightness with extra Brightness to the max, and yet it's almost pitch black.
The S21 Ultra meanwhile works fantasticly well with true HDR, Details in the Shadows and the Highlights, and really nice popping details.
I hope and think this is a software problem and can soon be fixed by Samsung. After all it's really embarrassing to not even be able to watch Netflix on a flagship device.
I got another problem. When playing hdr Videos in youtube, the brightness gets automatically to its maximum level. I can't dim the display anymore as it says the brightness is controlled by the app. Any suggestions how to circumvent that?