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Title: lens has a flaw
Review: All the L lenses that I have tested are awesome, except this one. The lens has severe front focus (about 1.5-2.5 inches depending on the copy) at around f1.8. Some people call it soft focus but it is really a front focus issue if you know how to test for it. I bought and returned four of these trying to get a good one, only to find that it is a design flaw. It exists in the majority of the series II, but often even the pros don't notice it because it only shows up at specific f stops. I wish Canon would do something about it, check out the canon reviews on the canon site for more detail.
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