this lens. And this one too. Sure, you need an adapter, but if they focus as fast as native lenses on the new E-M1 then they're valid options for someone looking for fast zooms in the m43 system. And we all know how often that request comes up. My point is . . . I'm not sure the E-M1 will only be for people who already own a bunch of 4/3 glass. If you're one of those people values IQ over size/weight (and there seem to be a lot of you), then these lenses will be interesting to you simply because they're so outstanding. Assuming the PDF-on-chip sensor works as advertised, the "m43" lens lineup just got a lot more interesting.