Here is a comparison off an hdr YouTube video test. Red generally renders as orange, gold or pink.
Whites and grey (ie dark mode menus/toolbars) appears green/turquoise. Also, detail seems to be much lower than the S8. Out of focus at times, almost. Text is crisp- but images seem to suffer.
I have two phones showing the same symptoms - so it's a feature here, not a defect.
Definitely disappointed in the screen compared to a phone that's almost 4 years old.
Any hope that Samsung can send out a calibration patch? Seems unlikely.