Well, I did shoot the Xmas tree repeatedly and I can't get a black dot...and for what I do, non-issue - and all cameras in the digital age have issues, banding, noise, yadda yadda...Canon has jumped on it and obviously learned from the 1Dm3 experience (I hope).
Anyway, here is photo of my boy, and then a 100% crop...this photo has no noise reduction, no sharpening, no post of any kind. I think it is ISO 200.















