Please see the 24mm comparison page for details.
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The 16-35 is almost distortion-free. Only by rotating the image 0.25° to be level, then using a ruler line could I then be certain (at full resolution) of a very small wave-type distortion (barrel distortion correcting to pincushion). An excellent performance.
The17-40 is almost distortion-free. Only by rotating the image 0.25° to be level, then using a ruler line could I then be certain (at full resolution) of a very small amount of pincushion distortion. An excellent performance.
The 24/1.4L II has only a very amount of barrel distortion, impressive for an f/1.4 24mm.
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