If this isn’t proof that how pen makers classify nibs is almost meaningless, I don’t know what is.
In order, from finest to mediumist: Pilot Prera (fine); Pilot MR (fine); Faber-Castell Ambition (extra fine); Waterman Translucent (medium); A. G. Spalding Maple Wood (medium); Kaweco Classic Sport (extra fine); Rotring Freeway (fine).