Well, please understand that what follows is only a surface-level comparison of the 40D vs. the 5D mk ii. Using the mk ii’s image as the baseline, the 40D captures around 63% of that image due to the crop. Given the quantity of pixels on each sensor, that’s 63% of the mk ii image with 48% of the pixels. Never one to overemphasize pixels I compared the sensor area of the two cameras. In that comparison, if my math is right the same 63% of the image is captured on 39% of the mk ii’s sensor area. My evaluation criteria may be way off base, but those numbers tell me the cropped mk ii image should be better than the 40D image out of the camera. If I’m looking at this incorrectly, I’ll be happy to learn something from this post.