To me, the Fuji XF18/1.4 is really good. I haven't tried the Voigtlander so I can 't compare. But I feel the Xf18/1.4 is one of the best Fuji XF lenses.
The XF 18/1.4 is really good, no vices and gives clean, crisp images.
It's pretty much in the modern style, no quirks, and sharp across the frame.
It'll make nice sunstars when given a backlit situation and flare is well controlled.