Seems like you have a few things to consider -
budget
main use (landscapes, street etc.)
weight/size for hauling on camera
balance on camera
I can only speak from my experience. I prefer the 16mm not for speed (a bonus) but for being somewhat the equivalent to a 24mm lens. I also found it to be sharper than the 14mm. I don't find either the 14mm or 16mm to be super great performers of auto focus in dim light but the 16 fairs better and both can do it.
Just to be fair - 14mm might be the all around for landscapes, the 16 is good for some landscapes and definitely a winner for street photo. Both are usable for interiors with the 16mm having the advantage where hand holding vs tripod is concerned. The 14mm is less weight to carry around but the 16mm is not particularly heavy just solid.
Zoom - Fuji does make a nice wide angle zoom. It rates between "good to excellent" overall and if you learn which settings are best at each end of the zoom, the only bad shots are the ones you goofed on (not the lens). As example, some f'stops are better choices than other at each end of the zoom. Figure these out and get the best out of the zoom. Biggest drawback is size and weight.
While I find the Pro 1 to be a brilliant camera (and now the Pro 2 more so), neither fit my style of shooting given I use my left eye. Interestingly enough, I made some of my very best professional shots with Fuji's 645 series range finders. While the other X series cameras are a better fit for me, I still have a love for not just how well the Pro 1 performs but its own aesthetics - beautiful camera.
Add: Just as there is Mac Rumors, there is also a site that is Fuji Rumors and its not a bad place to visit and also Fuji X Series Camera Forum. Btw, the very first two 35mm film cameras I learned from were the Nikkormat FTN and Canon AE-1. You went the way of Canon and I went the way of Nikon and we both found paths to Fuji.