One day I'm going to upgrade from my E-PL1 to the E-M5. I live in the rainy province of BC and think and would really enjoy the weather sealing. So eventually I'll need the weather sealed lens as well. The body upgrade is not in the budget right now, but the lens could be. I'm starting to get annoyed with the slow focus speed of the E=PL1 with the kit lens. Would the 12-50mm be any faster on the E-PL1?