I acquired Oly 9-18 lens during recent sale on refurbished lenses so I got a good deal. I decided to return the lens as I found the results not even worth the discounted $400. Without a doubt, it was by far the worst performing lens I have used on m43 format. IMO, it lacks colors, contrast and sharpness at 9mm, details are smeared in the corners. Very dull images unless post-processed. Granted, I am not experienced in UWA so I am comparing this lens to Panny 14, 20, PL25, Oly 40-150, Pany 14-45, Oly 45mm, Pany 45-175, Rokinon 7.5. All of those lenses are just so much better, it's not even funny. I tried to like it and even posted some pictures in the image archive section. The images seriously lack punch and required a lot of post-processing for CA/purple fringing, sharpening, contrast, saturation, etc. None of the images could come close to the sharpness I'm getting with RX100. The sharpest setting on 9-18 was 18mm (not the reason I bought the lens). To conclude, IMO, 9-18 only has its FL going for it. I'd rather do stitching or defishing than dealing with dullness. Rokinon gives me lush, contrasty images with incredible sharpness and punch which are retained even after defishing w/Hemi plugin. No pixel peeping needed, one can just mount another lens and see the colors pop on LCD or EVF. I have no desire to try another 9-18 copy. Will stick with my trust Panny 14 and Rok 7.5. After over 3 years with m43, I finally got.a mediocre lens.