43rumors reports that the official position of Sigma is just to port APS-C lenses to :43: and not design exclusively for the system: Sigma says they will not design lenses for MFT only. | 43 Rumors It's certainly a shame but understandable. If they do port more lenses to the system though, we could have two advantages: one, more economical choices, and, two, a couple of totally outstanding lenses not available from other manufacturers. I have the 35mm f/1.4 and the recently announced 18-35mm f/1.8 in mind. True, they are both quite large for the system. But esp. in the case of the zoom, we have nothing even remotely similar. The only thing that comes close is the Oly 14-35 f/2, which is (IIRC) heavier/bigger, probably more expensive and slower to focus with adapter.