Hi, I'm thinking of switching to micro 4/3 due to the great lens selections. But as many newbies, I'm quite unfamiliar with them all so would need your help here. Versatility and convenience, I think the 12-40mm would be much better. The confidence of i-wont-miss-any-moment-due-to-lense-changing really gravitates me toward this lense. But on the other hand, for the same $, I can get THREE great lenses at the same times. The wide 9-18mm, the 25mm and of course the infamous 45mm. Ignoring the few extra mm that this setup provide, how would the optical compare to the 12-40mm lense? Would it be worth it to carry extra and switches lense? I appreciate all inputs, thank you all for your time.