Very good quality ! Focus super fast, very silent. 2 things can hurt : It's on plastic so lighter (better for me) but people prefere metal ^^ And the rinf of manual focus does not have stop but i use only auto focus so it's good for me ^^
before buy something, i spend many time on the web, searching informations, tests, videos, commentarys, and when i was looking for informations about that lens, I saw only good things, I saw Pros photographer saying it's one of the best macro lens on micro 4/3. SO i bought it Now i have to find time to go outside for shooting ^^
Jack FYI, about your question if the lens is 1:1, as far as I know it's actually effectively 2:1. The physical projection on the sensor at closest focus is 1:1, but because the MFT has a crop factor of x2 compared to 35mm FF, the resulting digital image is an equivalent of a 2:1 FF macro lens.