It was obvious thru some initial reviews that this lens is an impressive one.
I am yet to see the detailed MTF curves other than the simple ones in the Fujifilm site however the 100% corner crops at various apertures by some owners have led me to believe that this lens is a real gem; reflecting the extensive optical engineering expertise of Fuji from the tiny lenses for the P&S cameras up to the current Hasselblad array to Large Format series to zooms for pro Studio TV cameras. Fuji decades long have been regarded as somewhat Japan's equivalent for what Zeiss is to Germany.
Yesterday Ken Rockwell has issued his review about this lens. For me, he is not a reliable source to be taken with much seriousity like some established lens test sites deserve, however some comments and especially the photos in his review are quite remarkable.
"This Fuji 35mm f/1.4 is an aspherical 50mm-equivalant lens with performance better than LEICA's equivalent LEICA SUMMILUX-M 50mm f/1.4 ASPH."
I would like to listen to what some our forum's members who own the X-Pro1 as well as the Summilux 50mm Asph. with the M9s would comment on the subject. Perhaps just for the sake of this lens alone the X-Pro1 is worth to buy.