As a general rule of thumb, most lenses improve substantially when stopped down one stop.
In this comparison, we can expect the Canon 24mm ƒ/1.4L II to fall in that camp, with greatly reduced vignetting, and the reduction of aberrations present at ƒ/1.4.
The same holds true for the Zeiss 25mm ƒ/2 Distagon; whatever aberrations exist, they will be at their worst at ƒ/2, and for this reason, a performance wide open at ƒ/2 that is on par with the Canon 24/1.4LII at ƒ/2 could be a strong statement about the lens quality in general. But vignetting should not be expected to be similar at ƒ/2— and I prefer the vignetting at ƒ/2 for its effect.
The Canon 24mm ƒ/1.4L II is significantly wider in its field of view. This gives it slightly more depth of field.
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