Summary: Bought Fuji 18mm along with XT-1 body as light weight alternative option to 5d mkIII and various Canon L lenses. Unfortunately, couldn't get on with Fuji. Sent to Wex for part-ex to be informed that 18mm lens has moisture in it - 2 months old, not used in wet and stored as you'd expect.
Summary: I purchased this lens and it functioned well for over 10 days of indoor use at home. After a firmware upgrade to 1.10, it started to malfunction: would not always make contact with the body (X-M1). I upgraded the firmware to 1.20, the issue persisted.