I'll reiterate, pretty much everybody needs to just buy this lens and forget about researching it. Every time I put it on the camera...it's magic. It doesn't care what it's aimed at, the result will be art, at least on some level.
40 minutes after sunset (well into the "blue hour"), hand-held, center point autofocus (then re-compose), 1/100 second, f/2, ISO 400, my front yard, cropped about 60%, distance to deer about 250 yards. This obviously doesn't showcase any bokeh or much color saturation...but I recently was looking at some of my snow shots, and still got a kick out of this one. (sorry for the small web size).