What software are you using to decode/view the CR2s? Ideally, you should be using DPP.
When using Digital Photo Professional, it applies a different amount of luminance and chrominance noise reduction (0 to 20), based on the ISO the image was shot at. I absolutely love this feature. It usually gets it bang on.
On the 5D Mark II, it applies 0/0 on ISO-100, but, on the 5D Mark III, it applies 1/1 at ISO-100.
The higher the ISO you shoot at, the greater the noise reduction that is applied in DPP. From memory, ISO-3200 on the 5D Mark III, it applies 6/7.
When I get home, I'll download your images and have a play around with them in DPP.
H
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