Currently I owned three lens with my GF5, the X14-42, Pana-Leica 25/1.4 and an old manual focus Rollei 50/1.8. Now I want to replace the Rollei 50/1.8 with an auto-focus one for daily portrait shooting. I reviewed threads of the three threads for Olympus 45/1.8, Olympus 60/2.8 and Sigma 60/2.8 in the forum. Their sample images are good and it hard to make the decision. Could you give me some advices? Thank you.