Hi there, I own the E-M5 and is thinking of getting the 9 -18 wide angle zoom. But can't decide between the u/43 or 4/3 version. With the 4/3 version I can pick one up for around $150 cheaper and my e-m5 came with the adapter. Size is not really an issue for me as I plan to be taking tripodded night photography/landscape most of the time with it. The slower auto focus speed 4/3 lens shouldn't be as much of an issue because I'm not using the lens for walkaround. If anyone could provide any further insight to the above or better still have used the 4/3 9-18mm on a u/43 body or e-m5 that would great! Many thanks in advance!