Needs a thin adapter
Only 1.55mm separates the two registers — thinner than a plain adapter can usually be built. An adapter may exist, but expect it to be a precision part rather than a generic one.
Coverage & framing. Micro Four Thirds lenses are built for a Micro Four Thirds imaging circle, which is smaller than APS-C. Expect heavy vignetting or a forced crop on a Fujifilm X body.