Well I talked to Canon today..... they said they found nothing wrong with the camera even though they admit the photo samples I sent from 4 different lenses did not look in focus. In the end, they are refusing to give me a new camera body or refund my money. They did insinuate I did not know how to use the camera. I reminded them I have owned a 5D, a 5D2, two 5D3s plus several other high end Canon bodies over the past 16 years & never had any problems with them.
So any suggestions on what to do next? I have spoken twice with a high end Canon Executive.
It is a difficult thing to sort out. Canon do not believe my initial focus problems, although I do not seem to have the same issues, even in low light (I focused on a still subject at 1/10sec f4 and ISO12k, which is impressive because I could hardly see). I still have a problem with my sensor and the yellow stripes but am busy at work and home and it is difficult to spend time trying to get things fixed or talk to people. For now I also need the body and the quieter shutter. But I will have to sort it out before the summer when I will need those shadow pushing abilities
For now here is a shot at ISO10,000 taken at the weekend. Cleans up OK and will print maybe A3 in size if I need to. Main problem is DR, those patches of snow are hell. Do not try pushing too much shadow detail at this ISO.