Want a Fast Lens for Micro Four Thirds? HandeVision IBELUX 40mm f/0.85 is 71% Off
This is about as fast as it gets, though f/0.85 on Micro Four Thirds is equivalent to f/1.7 on full frame, in depth of field terms.
At about $549 (a whopping $1350 off), it might be a fun buy for the M4/3 shooter. Limited supply at this price according to B&H.