Having shots extensively with the Canon 5Dmk2 and Nikon D700 where I work, I have to say that the 7D does NOT measure up to its full-frame counterparts. I've concluded that the 7D is little bit better than the consumer-level Rebel XSi (an excellent performer) but is a couple of notches down from the almost noise-free images of the 5D and the D700. Well, it does cost $1000US less...
That being said and as a point of reference, I WOULD shoot an outdoor beauty portrait at ISO 800 (1600 if I really have to) with the Canon 7D and not feel bad about it. I am no expert pixel-peeper nor do I want to be but I think the 7D still manages to retain quite a bit of details (notice the veins on the leafs) up to ISO 3200.
But all this is relative and very much subjective. This hardly a scientific test but for my defense, I did shoot all cameras on assignments.
You do have to click on the images below to really see the differences.
Canon 7D, 17-40mm f4L at 40mm, f5.6, shots in RAW, converted to JPEG with Lightroom on the default setting.
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Nice, informative set of images.
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