i brought a x100f to deserts twice and ended up storing it in a plastic bag as i realized how much dust ended up caught around the pancake and especially since the motorized sliding shade of the hybrid viewfinder got stuck diagonally essentially on day one.
after returning from the assignement, i was able to get most of the dust off the outside with a soft toothbrush and vacum cleaner, but the slide is continuing to get stuck occasionally. in that case, i got to power off the camera, shake it a bit and switch it back on to allow the motor to retract the shade.
so, with regret, i strongly have to advise against taking the x100 series to harsh conditions. ended up finishing the job entirely with the 5d’s and 24-70 & 70-200 lenses.