Resolution (f4)

Performance at f4 (Zone A: centre frame)

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Canon 24mm L / f4 centre frame Zeiss ZF 25mm / f4 centre frame
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1 point

Both lenses are considerably sharper centre frame at f4, and both could be considered excellent. The Zeiss once again just edges it with that lovely wiry accutance and strong spatial separation.

Performance at f4 (Zone B: near field, right side)

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Canon 24mm L / f4 mid frame Zeiss ZF 25mm / f4 mid frame
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0 points

Performance at 24mm: f4 (Zone C: upper left corner)

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Canon 24mm L / f4 corner Zeiss ZF 25mm / f4 corner
1 point
0 points

But once again the Canon looks much more attractive across the frame on average, with the exception of a sweet spot right in the middle where the Zeiss excels. Note, too, that the Zeiss ZF 25mm is not entirely free of vignetting at this aperture: the corners remain a little murky.