+1. I am less than impressed with the noise on my 5DIII. I find the 22mpx enough for me, but expected far better low noise performance. Using Topaz denoise doesn't help much either. OTOH the problem is probably behind the Camera.
Here is an example 1/4000s, 400mm F5.6 ISO4000, its easy to see in the two squares. Now thats
at ISO4000, so obviously at anything higher its worse. In this case when I tried Topaz denoise
(the example here is the BEFORE state) it worked pretty well.
So, is this too much noise? And its not in the darkest parts