This makes interesting reading, I ended up returning my 13 after sending some photos to apple support in a chat. The rep I was chatting to said "that's not right" but that was all I got. He said if I wasn't happy, just return the phone "apple want our customers to be satisfied" and that they would investigate the issue, but not share the outcome.
I just noticed just a few days of receiving the phone. One of the first photos I took looked like it had an effect on it. Best description is a Photoshop median noise filter effect. Looked way worse that any of the photos from my X, which I'd upgraded from.
Moving from the X was impressed with night mode, so I'm left with a quandary. I don't know if I should go for a 12Pro over the 13Pro.
I'd like to have the option of taking ProRaw, mainly for occasions when I'd be taking photos to keep.