I try to avoid switching lenses when walking places unless the focal length needed is predictable. On the other hand I am not a big fan of slow lenses with variable apertures. The Fuji 18-135mm f/3.5-5.6 offers an amazingly useful range (27 to about 200mm) at the cost of slower variable apertures. Somehow we have the impression that Fuji tries to get the best out of this compromise. That is why we bought this zoom as our main travel lens for the Fuji X-T1. Here is our first set of field test images (click on thre 'o' option to view larger images).
Overall this zoom does not disappoint us. Autofocus worked fine unless you focus on areas with no edges at all.
Adobe Guide: Making the Switch from Aperture to Lightroom. This is an official Adobe document. For the records: we use Lightroom since version 1.