I'm attatching a file to show the coverage from a 24mm fisheye on a Mamiya, vs a 24mm TS from the canon 24mm TS on a 5D.
Remember, the image from the 5d is about 4300pixels across while that of the mamiya about 4000 across. I had to resize the images to get the subject to match with the same number of pixels.
The image from the 5d is definately superior, but not by too much.