Fuji has had the film simulations since the original first-gen X100. Every generation gets faster, has better AF and an added film sim or two. The first and second generation are slow by today's standards and AF is not fast or reliable, but generation three ("X100T") and four ("X100F") are quite good and available used. Generation five ("X100V") did get a new lens that's somewhat sharper as well, but it's probably not why you buy an X100.