B&H Photo has all the Zeiss lenses for Canon and Nikon.
The Zeiss 25mm f/2 Distagon is a stop faster than its f/2.8 sibling. This series evaluates the same scene as the prior one with the 25/2.8.
In Guide to Zeiss:
Includes the usual HD and UltraHD images and generously-sized actual pixels crops.