I've said this before, but the real superpower of the XF27 is its size. That cannot be overstated. Fuji has given you plenty of smallish lenses -- the recent f2 weather sealed primes especially -- to choose from. But none of them comes close to being as tiny as the 27. I started off thinking that didn't really matter... it didn't pull at me, I didn't think I would ever buy one, even used. Then a friend with an XE1 got it, and I put it on my XT1 one day, and my jaw dropped.
1. With this lens on, it feels like you're holding just the camera body. It will hang flat up against you, it will slip inside your coat hanging on a strap, it will look 50% less "DSLR" like and thus be less intimidating to your subjects, and it weighs as much as a hummingbird. It can honestly cut the total camera weight in half vs some of the zooms.
2. The field of view is incredibly useful, second only to the 23mm lenses. You can do a TON with that length.
3. 2.8 isn't blazingly fast, but it will spit out some bokeh, and it will take you right up to dusk without making you drop the shutter speed to 1/30. Something this small has no business having an aperture bigger than 5.6, to be honest. It's a bit of a miracle.
4. The image quality is (in my opinion) about an 85-90 on a 0-100 scale, where the 56 and the 2.8 zooms are 99s. Meaning that if you stop it down to f4, you will get very good sharpness everywhere, and at f2.8 your subject will be ALMOST as crisp as the faster primes.
5. The autofocus is old tech (1st gen Fuji XF), but the little glass elements it's moving back and forth are so damned tiny that it still manages to be plenty quick. AF has never been a problem for me with it.
6. I got ine from a forum member here, used, for about $280 I think. They do show up used, and I wouldn't hesitate to recommend getting a clean used one.
Andf finally, if it helps, some samples taken with it on an XT1...
(Circular polarizer)
Elk Meadow by
gordopuggy, on Flickr
(Circular polarizer)
KBRX9046 by
gordopuggy, on Flickr
DSCF2147 by
gordopuggy, on Flickr
Straight out of camera
DSCF1772center by
gordopuggy, on Flickr
5 Year Old Ennui by
gordopuggy, on Flickr