Thanks for your interesting post. My only experience with Leitz lenses is with a 50mm f4.5 Focatar 2, although my findings are broadly in line with yours here. Prior to getting the Focatar, my go-to lens for 35mm was a Minolta CE Rokkar 50mm f2.8. In comparison, the Focatar is slightly less contrasty, but does resolve just a tad more detail, and I significantly prefer the tonality to the much more "in your face" Minolta. I've used both lenses in Condenser (Focamat 1b) and Diffusion (Durst) enlargers, and have a similar preference for the Focatar in both.