Just took delivery of the new Olympus 12-100, and thought I'd see how good it was mounted on a Panasonic camera (so just using the lens IS only). The answer - very good. Following image shot at 100mm (200mm Eff) @ ½ Second handheld with my GX8. Tried it several times and all came out sharp. Not too shabby ? Nothing exciting in the photo, just some switches that I was testing it with on my work desk.