Please see the 17mm comparison page for details.
Mouse over the image below to compare. Both zooms show faint pincushion distortion (bowing inwards), typical for a zoom lens at its long end. But it is so low it can be ignore.
The 17/4L shows the lowest distortion and the most natural looking image.
The 17-40/4L has strong barrel distortion at 17mm, with the 16-35/2.8L II showing somewhat less of it, but both zooms look positively stretched compared to the 17/4L.
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