I've been slowly amassing a little arsenal of fast 50s - I figured it was time to put them all to the test! Up for bat are: Nikkor S-C 1.4, Canon FD 1.4, Minolta MC Rokkor-PG 1.4, Olympus F.Zuiko 1.8 and Fujinon 1.4. The Fuji may not be at its full potential - it still has some yellowing in the radioactive elements as well as a lot of debris and fungus on the inner glass surfaces. A few other quick notes: The Nikkor is the most rugged (I can see why so many war correspondents used Nikon). It is also the biggest and only focuses to 2' (all the others do 1.5'). Boo!! The Zuiko has the compact edge, but it's the only slower lens so that's not really a fair advantage. So here's some center crops from a hastily-assembled outdoor test scene. Wide open: f/2.8: f/5.6: Beyond f/5.6, all lenses grew softer with diffraction. Impressions: The Canon FD seems to have the cleanest renderings at wider apertures. It also seems to let more light through. Not too surprising, since it's the youngest of the bunch. (It does please me to see this, after dismantling the front element group twice to clean out some gnarly condensation stains.) The Nikkor and Canon BOKEH is a bit nervous. The Minolta and Olympus seem a bit more pleasing in that department. The Fujinon has the most pleasing soft effects, which is good because up until f/5.6 it's not very sharp! (I'll have to see if more UV bleaching and and some inner surface cleaning helps...) I've had the Nikkor on road trips and gotten some impressively detailed captures with it. Any of these lenses - even the ailing Fuji - could match this at midday landscape aperture settings. At least in the center. (Still have to run corner tests...) With it's small size, good performance and gentler BOKEH, the Zuiko would make a great all-round choice. The Minolta has good personality and decent sharpness. The Canon is the most clinical. The Nikon is the most rugged. The Fujinon might really stand out for soft portraits and such. At least that's what I'm finding, so far!