Almost a year ago I did a review of the Fujifilm 35mm f2, and this is what I wrote there:
In fact, as I've written in an older post, Fuji ought to continue this trend with the smaller lenses. The 23mm f/2 is on the cards, it seems. Why not see a 16mm f/2 or even a 56mm f/2 in the road-map? Smaller, WR lenses, that sacrifice a stop of light but not optical or use performance. And if the 56mm f/2 seems an odd choice, consider historical examples, such as Zeiss, which had f/1.4 as well as f/2.8 lenses at 85mm. The slower lens was always better edge to edge, smaller and lighter. Ultra shallow DoF is not the only requirement from a high-end optic.