My main body and lens for wedding are the 1Ds2 + 24-70 f2.8. I have the 7D but I usually just use it with the 70-200 so I don't have any direct comparison with the 1Ds2+24-70 even after 2 years of owning both. Recently, I shot a wedding mostly with the 7D+17-55 f2.8 IS which is comparable to the 1Ds2 + 24-70 in specs and I was disappointed in the 7D combo. The colors seem to be a little wash out, not as saturated and the details are less sharp with the 7D combo. The wedding was held in high noon so noise is not an issue. It wasn't a disaster by any means but since my eyes are so used to the pictures from the 1Ds2 + 24-70, I immediately noticed the difference. I though that the 7D, albeit a cropper, is 4-5 years newer than the 1Ds2 in sensor technology, should be able to match up to the 1Ds2 especially in bright light scenarios but apparently it is not.