Ive been using the Fuji X system for just over a year and have recently purchased an XE2, I normally use my 35mm f2WR with it.
I also have a Nikon FX system and several old manual focus lenses of varying brands.
Ive recently been using the Nikon 20mm f1.8G lens with great results but the focus throw is small I can sometimes find it difficlut to get pin sharp focus.
Ive also used the Nikon 85mm f1.8G lens with great results.
One of my favourites is the Helios 58mm f2 lens which produces really good results.
Ive not used my Tamron 80-210 manual lens yet.
I dont find it that easy to use the split image focussing system or indeed the focus peaking, I find it much easeir to use the plain screen to focus.
Just thought Id share my experiences.