Olympus and Pentax have one too. Minolta made a 35mm for the old manual lens mount, but doesn't have one for the auto-focus cameras. 24mm and 35mm for the manual mount, and the TS-E 24mm, 45mm, and 90mm for the current electronic mount. Besides fixing perspective, you can use the same feature to screw up normal perspective. I took a band's CD cover picture, where the guitars are the size of battleships and the guitarists' heads are the size of gnats.
Art is Truth.
There will be some overlap to help you assemble the halves into the final image. You can end up with a scene that uses about 70mm width and 24mm height. This will give you strictly higher image quality that you'd get with a 6x6 medium format camera and cropping to get a panoramic slice - merely 55mm x 20mm. The Canon TS-E lenses will shift in any direction, and have clicks every 30 degrees. You can thus also get a shift somewhat up or down at the same time you shift hard left to get one half, and reproduce the exact shift amount and angle to take the second half.