In the last several months I have transitioned from Nikon DSLRs and Nikon pro-level lenses to the Fuji X system. I now have several Fuji X lens and I have found all of them to be extremely well-made and optically superior to the Nikon lenses they replaced.
This Fuji 55-200 lens replaces the Nikon 70-200 f4, generally considered one of Nikon's best. The Fuji is sharper wide open and in mid apertures, is much smaller, lighter, with equal build quality. All these Fujis mate so well with the Fuji X cameras and produce awesome images that will thrill you.