Managed to get a loan of a friends Topcor-S 5cm f2 (M39) lens from the 50's with an adapter so it works on my Fuji.
The lens is an absolute joy to use, nicely made with a rapid focus level which is properly cool. Close focus is about 1m which isn't great but a 10mm tube should sort that if I need to get intimate with a flower. Aperture is manual only so no auto stop down - not an issue with the Fuji as it works perfectly compensating in AP mode to show the metered exposure in the EVF. Focus is a cinch as I have a dual view option with a 100% crop with focus peaking to help nail the exact plane.
I bunged it on the camera and took the dog down to the local park before dinner for a quick play. They are all shot wide open to see how it renders the OOF areas....nice and gnarly as it turns out which is just what I wanted.
These are jpeg files with the Fuji set to its Monochrome Film Simulation then tweaked a little in Lightroom.