The Fujinon XF 90mm f/2 R LM WR is a lens that I'm really interested in and it will probably be my next purchase, maybe in early 2016. I don't do close to the amount of portrait shots that I'd like to, but still I'm really interested in getting this lens.
I'm sure it would be great for street photography. It is nice to be able to get up and close to your subjects in street photography, though it might be hard or nearly impossible sometimes specially if you don't want to disturb your "target", so with a little bit longer focal length it would be nice. It's still not a tele lens and it's got a rather large aperture and is supposed to be the sharpest Fujinon lens to date.