I use mine in the same way that Willie_901 does. The XF10-24/4 on my XT-1 accounts for 99% of my income and that these days is 100% Real Estate listings. This lens makes even the XA-1 shine, though I'm almost always shooting it off the LCD at waist level which has brought me 180˚ back to where I started with a TLR in my hand. 🙂
I'm NOT a big a fan of the lens on my XPro-1, but that's mostly because it makes the OVF obsolete with this lens. The XPro-1 is best for Primes IMO. Yes, OPTICALLY it works fine with the EVF or (non-tilt) LCD of course, but it is an aesthetic thing for me.
I don't at all miss 2.8 at these wide angles. Though I do only occasionally miss the slightly wider 8mm of my former Sigma 8-16, even if Sigma starts offering that lens in XF mount, I'll likely keep to the better built and balanced Fuji.