i'll bet 99% of forum members go their entire photographic lives without mounting a 1000mm anything on anything.
as to the question, ive only heard great things about the hexar. if its a better film version of my much loved x100, it has to be one of the very best. i'm actually afraid to buy one in that it would force me to supplant all my other cameras and legacy lenses the way my x100 did with my digital gear!