This lens is highly portable. When attached to an X Series camera body, it weighs about half** that of a single-lens reflex camera with a lens of the same focal length and F value, plus it's quick to use thanks to the high-speed, quiet autofocus.
It produces not only beautiful bokeh part, but also maintain the sharpness with accurate focusing even in a shallow depth-of-field. This is advantage of Mirrorless system over SLR thanks to focusing on image sensor itself rather than on separate PD sensor.
The shutter sound on X Series bodies is equally quiet, so it's easy to capture more natural shots of subjects