peterjaena posted a reply:
Take shots using the lens you want to be tested. Look at 100% crops at center, top left-right, bottom left-right. Compare the sharpness. All lenses are softer at the edges, but the good ones will have better sharpness compared to others. The easiest way is just to read the reviews at photozone.de . They include MTF sharpness scores of lenses center border and extreme borders. :)
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