Viltrox has launched one of the most compact lenses for Fujifilm X cameras, measuring just 0.6 inches thick and weighs 2.1oz. The lens supports autofocus and is equipped with an integrated protective cap for the front, which doesn't have to be carried separately.https://www.notebookcheck.net/Viltrox-28mm-lens-makes-Fujifilm-X-cameras-with-APS-C-sensor-pocketable.957628.0.html
Not in a million years. F4.5? Lol, just what APS-C needs. Both the f2.8 versions are pancake and the XF produces stellar results. Why on earth would you give that up for a reduction of a centimeter? I would be shocked if Viltrox sells even one of these for X mount.