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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Since 2007, Diglloyd Guide to Zeiss is the authoritative reference and review for all of the Zeiss ZF.2 (for Nikon) and Zeiss ZE (for Canon) DSLR lenses, including the Otus line.
It includes hundreds of pages of exclusive coverage and high resolution Retina-grade examples, in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, and recommendations and practical usage tips.