I photograph sunrises and sunsets a lot. One thing that has always irked me about the Fuji X cameras is that they could rarely achieve a focus on clouds. My work-around has been to grab focus on a contrast point on the horizon, and, while holding it with a half-way press of the AF-L button, re-composing the camera for the sky shot I want.
At dawn this morning, with the camera set to the new "Wide/Tracking" AF mode, I had little trouble achieving focus on just the clouds in the sky, even though they were extremely low in contrast. It was interesting to watch the focus points jumping around in the viewfinder as the camera gathered focusing information. Sure, it missed once in awhile, but so do my DSLR;s. For the vast majority of the shots I took the new firmware held the camera and 18-135mm zoom to a correct focus.
Score 1 for Fuji.