The Zeiss Otus is easily the biggest DSLR 55mm currently available. I say currently, because I'm sure in some lab in the depths of upper Siberia a technician made a 50mm the size of a small child, just because. But the Otus shouldn't surprise us, Zeiss will never shy away from the pursuit of image quality at the expensive of "convenience."
ZEISS announced that it was working on a new line of ultra-high-quality lenses last year. These lenses were being designed from the ground up to provide unmatched optical performance for high-resolution full-frame cameras like Nikon's D800.
Well, the first fruits of all that labor have finally arrived on digital shelves in the form of the Distagon 55mm f/1.4 Otus: a lens ZEISS promises will perform better for you than anything else on the market... assuming you can afford it.