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We recently acquired specifications for all DSLR lenses by Carl
Zeiss and almost always the Canon EF-mount version is larger and
heavier than the Nikon F-mount version. The difference ranges
from small (20g / 1mm) to large (120g / 8mm) or up to 20%
difference by weight and 12% by dimension.  Is there a technical
reason why there should be a difference in size? Both always
cover the same full-frame imaging circle and have the same
optical design, number of elements, etc. Would image quality be
affected by such differences?  share|improve this question Which
lenses have the largest difference in weight? –  Matt Grum Apr
27 at 10:28 I would like to know the same thing Matt asked.
Could help a lot in offering a valid answer. –  jrista Apr 28 at
4:45 By weight, it is the Zeiss Distagon T* 2.8/21. By volume
the Zeiss Distagon T* 2/35