I'm sure it has horrible coma at the edges.
I guess it's because traditionally lenses aren't really designed to resolve point sources of light. We're a special bunch who scrutinise lenses in this way. It would be really nice if Canon gave us a lens like the Nikon 14-24mm. As mentioned before, I have seen the patent application for the Canon version. I'm hoping it's not too far off from the shelves!
H
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