currently i only have the 9-18, 20 and 45.. I'd love to have the 12-50 added to that group. I'd probably also use it for daylight shooting and the casual/occasional macro here and there. Personally, I don't really go into much pixel peeping.. and find the 12-50 shots from Robin Wong sharp enough. For around $400 additional to the body its a good value as an all around above average performer, and I'm thinking I'll be able to use it more than I used my 50-200 before. Just keep in mind its not a 12-60.