Images used here were taken from the comparison page.
Click to see larger images which will make the distortion more obvious. The images are off-level by 0.3°, as measured in Photoshop.
The 24/1.4L II shows a very slight “wave” or “moustache” distortion: barrel distortion out to the edges, then reversing to pincushion distortion. For a wide angle prime lens, this low amount of distortion ia excellent; the Zeiss ZF 21/2.8 has substantially more “wave”, though the Nikon 14-24/2.8G zoom at 24mm does even better than the 24/1.4L II.
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EF 16-35/2.8L II @ f/8