The good news is that the performance of our 0.7x optics for micro 4/3 is really good, and I expect that some pixel peepers will prefer it over the NEX version. If you look at the MTF curves in the white paper you can see that the m4/3 version gives higher performance in the corners than the NEX version. We could have saved a lot of money by re-using the NEX optical cell for the upcoming m4/3 Speed Booster, but we decided to maximize image quality instead. '
So good news for m4/3 users.
I can certainly testify to how good it is from my experiences yesterday using my Nikon G 28mm and 50mm f/1.8 lenses.
For discussion - join me over at Google+