I think of a camera as the photographer's violin. And while some believe that Stradivarius is "the best," others know that some players (Sarah Chang, for example) must use a Guarnari Del Gesu, because it will do what they need it to, and the Strad won't. Hilary Hahn is similar. She uses a French copy of the Guarnarius. Either of them could have a Strad if it were right for them. So I think this same idea applies to cameras. If a Leica were the right instrument for a given photographer, as it often is, they will probably eventually get one. But some shooters will do better with something else; and I can easily believe that the "something else" will often be a Fuji.
May the light be with you.