I am not a scientist, I do tests and comparisons based on what I shoot and need. These are recent shots with the 1DIII compared to older 7D shots taken in similar conditions. I could wait and test my 7D on the same scene but the results will be the same, basically the 1DIII is a thing of beauty.
ISO800, prints screen from DPP, no sharpening or NR!
ISO1600, prints screen from DPP, no sharpening or NR!