I recently bought one of these on e-bay after reading many highly positive reviews. Consensus seemed to be that it is very sharp. I however can't seem to get anything but mediocre shots. Now, I'm no pro but I have been known to take a few good pictures. I'm not saying this can't be my fault but I expected to be able to take some good shots and have only failed. They seem dull and lifeless. Sharpness is Ok but not praiseworthy. Could it be the lens? Does anyone else use this combo? How does it work for you? Thanks.