Watching the sonic game footages so far, Seems like the color mastering in game are messed up.
If feels like, they tuned it for a REAALLy high brightness. But what we're seeing is a detuned muted version of it.
Researching further, it looks like they "removed" HDR support from the advertisement a month ago.
For testing, Tp4 cranked his TV as much as possible, pushing to 400 nits or so, the colors of the track finally come alive.
So it seems, the visuals are NOT-well-mastered , again, probably due to multi-platform /hdr/yes/no issue, resulting in lack of polish.
Hades II, perfect colors.