I've been reading a lot of reviews about it, but there's just one problem. None of the reviews used a GH2/GH3 with the lens. They're all using Olympus cams with it. My concern is that the distortion will be AWFUL with a GH2/GH3 because it doesn't have built in correction like the latest Olympus cams do. Can anybody confirm or prove this? How does the lens fare with the GH2/GH3?