I'm using 35mm when out and about and the 16mm when at home with the kids.
Just perfect.
I recall reading that the 14mm was purposedly built to match the X-Pro1 field of view. One of the few wide lenses, at the time, built specifically for the APS-C sensor
I thought it would be too much, but its very sharp with no distortion etc and it matches the images from the 35mm 1.4 (my fav lens), so a good combo.
I pretty much use the 35mm 1.4 for everything at the moment. I always prefer a 1 camera 1 lens approach.