Is anybody using the Sigma 60mm f2.8 on older Olympus bodies like the E-P1, E-P2 or E-PL1? I have been considering picking one up, but this note from Lens Rentals give me pause: "Please Note. We’ve had reports that some of the first generation Micro 4/3 cameras have issues with the Sigma DN lenses. We haven’t tested this ourselves, so we can’t confirm how widespread this is. With that said, you may want to think twice about using with early cameras like the E-P1 & E-PL1." Has anyone using this lens on the older bodies had any issues? If so, what are they? Thanks.