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I cut a one dollar bill in two, taped it onto a piece of cardboard (one half around the center, the other half on the top right corner), and took lots of pictures of it, with several lenses and with several settings, with manual focusing, with a tripod, with mirror lock-up, etc.
Then I cropped a couple of interesting bits of those images, and pasted those 100% crops in the nice tables you can see below. These results neutralize field curvature: the result for "center" is taken from a picture in which I was focusing at the center; the result for "corner" is taken from a picture in which I was focusing at the corner.
The camera used was a Canon EOS 550D. I set the white balance the same for all shots, and set sharpness at the minimum.
The lenses I have tested are the following:
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