Optical has no effect on the image, that's the whole point!
The only effect you'll likely see is when you use image stabilization when you're not supposed to. If you have the camera mounted on a tripod or other stabilizing device, you must turn the OIS off. If you don't, the OIS might "fight" you whenever you start a camera move, and that can lead to a "jerking" image.
Lol, I had just got my camera and 35mm adapter and was trying out some lenses with a panning shot and thought something was really wrong with my tripod. It was so jerky. Then it dawned on me what it might be but I didn't have my manual on me to figure out how to turn the OIS off (didn't know what OIS meant).
But does that affect the image Barry? Before I bought the camera I was corresponding with the guys at Swiss Effects about HD transfers to film and they always suggest leaving that off, suggesting it affects the quality when transfered to 35mm film.