kreuznach777

I agree. Fuji are making some sensational glass. The adaptors help those of us who own legacy lenses and need to devote available funds to acquiring one or two X camera bodies.

f2, 1.9, 1.8, 1.7 - all pretty much the same lens (marketing tags).

Konica Hexanon 50/1.7 - very sharp.
Meyer Oreston 50/1.8 - contrasty, nice blur. (pre-zebra. Avoid zebra DDR build quality)
Konia Hexanon 57/1.4 - beautiful blur.
KMZ 44-2, 58/2 - 00 serial (mid 1970s, gloss black barrel) very sharp and contrasty. 44-Ms better bokeh IMO.
Ricoh Rikenon 50/2 XR - very sharp, good colour.
CZJ Biotars (1960s, aluminium barrels - lubes getting old, haze problems common rear group).
Voightlander Septon, Schneider Xenon, V Ultron (50mm in that order of preference). DKL mounts.
Minolta 50/1.7 MD - inexpensive and good modern coated lenses.
I like the bokeh of SMC better than Super-Takumar 50s. The 55/1.8 is a great lens all round.
Tessars are good stopped down.

A bit wider, nice lenses: Hexanon 40/1.8, Yashica ML 35/2.8 (great lens).

You know the very fast apertures of these lenses were for accurate manual focussing not 'low light' as such.
It's distance to the subject/from subject to background that gives the separation as much as aperture.
Lenses that are over-corrected are giving the nervous back blur. Slower, simpler, old lenses can make beautiful portraits.