I had the green tint issue on my note 20 ultra. Comparing the s21 ultra to my note 20 ultra in hand, it's the reason I kept the s21 ultra. I didn't know how bad it actually was. If you are unhappy you can get a replacement if you have only had the phone 2 weeks. If bought direct from Samsung they give you 28 days. I thought as my s21 ultra hasn't got the green tint I thought maybe they had fixed this issue with the new phones. Obviously not.