I use the lens on a Panasonic G6 and am absolutely happy with it. A small problem which I experienced the lens at the aperture adjustment (iris chatter) is very loud I can not confirm, in against part of my is very quiet. However, I have a Panasonic camera and no Olympus where there is allegedly more frequently to a disturbing noise by the aperture adjustment.
Nevertheless, I would recommend to anyone MFT photographers looking for a bright lens is that with an amazing bokeh and sharpness unmatched.