The Fuji XF 18-55mm f/2.8-4 ASPH is an extraordinary lens. When a lens is just about optically perfect, there isn't much to say.
If you have an X-Pro1, you need one for general telephoto use. Forget slumming with LEICA or other off-brand lenses; you can't get anything sharper and any other lens won't autofocus or autoexpose or log data, and no other tele lens will have a diaphragm that opens and closes automatically as needed for focus and shooting.