I am looking for a fast 85mm lens. Not for portraiture, but for shooting live shows as a short telephoto, but I have a question regarding using such a lens on a m43 camera for portraiture. I know that the optical angles and such of any lens are the same on a m43 camera as they would be on the original camera. What changes is the crop of image. Would an 85mm lens work equally well on a m43 camera as on a 35mm camera assuming you stood back a ways to allow the frame to fill? I know that short lenses tend to distort faces (try a close up with a 28mm on a 35mm camera). I'm thinking therefore, the 85mm adapted lens, standing back, should be better than a 40mm adapted lens standing closer. Is my reasoning sound?