Canon TS-E 24mm f/3.5L

Included in the super-wide section as I only got it for my GFX bodies: 19mm equivalent, with tilt-shift!

Bought second-hand as a much cheaper alternative to the native GF23/4, not long after, I lucked out and managed to get the ‘proper’ Fuji lens, so never really used the Canon in anger and ended up selling it largely unused. Test shots in the garden though showed it to have excellent sharpness and the using the shift in each direction would give you a sharp square image around the 64MP mark with stitching.