I just got the XF 27mm F2.8 lens last week. On my X-E1 I must say, it's absolutely impressive. I find the focal length to be perfect for so many things, general walk-around, people, street, and more. I find mine to be stunningly sharp, just amazing. Autofocus is very quick. It's tiny and lightweight. Bokeh is pleasing. Rendering is nice, perhaps not "magical" like some faster primes but has nice dimensionality, excellent color and contrast. For the moment, it's my favorite prime, all things considered.
B