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The lens starts out very sharp in the center frame, with mid-frame and the corners looking a bit soft in comparison. as you stop the lens down to f/2.8 and smaller, sharpness takes off throughout the frame, with maximum sharpness reaching at the f/5.6 mark, where the lens demonstrates exceptionally good overall performance. the only thing to keep in mind, is that the lens does suffer from focus shift, particularly when comparing wide open performance to f/2.8-f/5.6 range, which is normal for most lenses of this class.