Looking for the best 28mm shift lens?

If you’re looking for a 28mm shift lens for architectural work and/or for “flat” stitching (higher resolution composites), don’t buy before reading my 28mm Shift Lenses article.  You won’t find a better assessment of the available lenses: the Schneider/Leica 28mm/f2.8 PC Super Angulon, the Nikon 28mm/f4 PC-Nikkor, and the Nikon 28mm/f3.5 PC-Nikkor.  Although the tests were done using a Nikon D2X, Canon users can use all of these lenses, too.