I did a little search on the experience with this lens on m43. Ddint find lots of info. I am MF noob and a m43 newcomer. Could anybody share more first hand insight into the image quality of this lens when used on m43? I have a chance to exchange my NIKON 20mm f2.8 for this lens, and will use it on the Nikon to play for a few weeks until I sell the body and from then on it will go on E-P3 and E-M5. Should I do the exchange?