Somehow, the 18mm has got a bad rep amount Fujifilm XF fans. ohm is one of those that values compactness and versatility over absolute sharpness. To that end, the 18mm is a better match. But small, reasonably sharp FF equivalents exist, too. Voigtlander's 21mm f/4 lens is more compact than the 18mm, and almost as inexpensive. On film or a modern FF mirrorless digital, it covers the same FOV at a similar DOF as the 14mm whilst taking up much less space.
When Fujifilm debut a FF mirrorless, compact-loving photographers will rejoice at the sudden bevy of FF LTM/M options.