2 years ago, Olympus announced (and subsequently released) its first lens with an f/1.2 maximum aperture, the M.Zuiko ED 25mm f1.2 PRO. I added this lens to my bag about a year ago, partially on the recommendation of Marius Masalar.
It has not disappointed.
Its images are unlike anything I've ever been able to create before. Olympus describes the rendering of the out-of-focus areas as "feathered" bokeh, which is about an apt of a description as any. Check out Marius's review here.