In article ,
RichA wrote:

Good luck to ANY company in matching this lens. Couple it to an adapter and
you can use it on m4/3rds.

http://www.bhphotovideo.com/c/produc..._0_ED_SWD.html

nikon 24-70 f/2.8 on a full frame camera, which is effectively 1 stop
*faster* (f/1.4 equivalent on 4/3rds), and it's *cheaper* too.