B&H Photo has all the Zeiss lenses for Canon and Nikon.
The wonderful thing about Nikon mount lenses with an aperture ring is that they mount onto just about anything: Nikon DSLRs, Canon DSLRs, Leica M Typ 240, specialty pro gear of various types, video cameras, mirrorless cameras of all stripes.
Hence Guide to Zeiss covers Zeiss ZF.2 (and ZE) DSLR lenses no matter what the shooting platform. In short, specific cameras are transient, good quality manual lenses last forever.
Moreover, the focusing helicoid, high quality construction and manual aperture ring (ZF.2 mount) make them a long term versatile investment, those ergonomics lacking autofocus but being ideal for many shooting situations for the predictable no-nonsense direct control, a lovely marriage with a mirrorless camera having a high quality EVF.
When I first started using Zeiss ZF lenses, I shot them on Canon DSLRs with an adapter. I still prefer in general the ZF.2 mount because that manual aperture ring is preferable to the ZE mount for Canon (ZE for Canon has no aperture ring). Thus the ZE mount requires an electronic lens adapter to control the diaphragm, which might or might not exist or have good build quality.
Having just shown the Zeiss 28mm f/2 Distagon on the now aging-design Nikon D800E, I wondered just how well it would perform on a modern sensor, a question I am in the process of applying to the entire Zeiss ZF.2 lens line. Because my theory has been for some time now that the Nikon D800E sensor (and cover glass) has some sort of sub-optimal interaction with lenses that holds it back at wider apertures, an idea I first broached back in May 2013. I think this might be true, judging from what I am seeing with the Sony A7.
In Guide to Zeiss:
Includes the usual HD and UltraHD images and generously-sized actual pixels crops.