That is my topic!
On my Fujifilm with metabones speedbooster I use:
- Minolta MD (IV) 50mm 1.4 - amazing rendering, easy to focus, vinieting
- Super Takumar 50mm 1.4 (8 element) - amazing built quality(!), VERY sharp even wide open, glow of bright unsharp elements
- Meyer Gorlitz Optik Trioplan 100mm 2.8 - Best portrait lens ever made, bubble bokeh, sharp but not too sharp
- Carl Zeiss Jena Flektogon 35mm 2.4 - Best 35mm lens, amazing rendering, focuses super close
- Piesker Picon 135mm 2.8 - very rare, Trioplan on steroids (also triplet lens)
- Carl Zeiss Jena Biotar 75mm 1.5 - true art lens with biotar swirl, sharp in the center
- Macro Takumar 50mm 4.0 - macro 1:1, very sharp
- Meyer Gorlitz Optik 250mm 5.5 - small and quite ok
I have like 20 more lenses but these are my top pick.
Usually I use 50mm lenses and 75-100mm for portraits.
Couple years ago I bought Mitakon speedmaster 25mm 0.95 for my Olympus Pen-f and even thou I owned like most of Oly primes I used Mitakon 99% of the time. Now I'm faster at composing and focusing at the same time with manual lens than using AF lenses. Oh and I have 2 small kids that are always in the move. I always shoot in single mode.
TIP: with manual lenses always focus lens from infinity.