We've just received our review Sigma SD10 (after a little mix-up with the courier) and I'm happy to report that resolution is identical to the SD9. I decided to test this immediately after we read reports elsewhere that resolution was significantly lower because of the use of microlenses. In our own shots of a standard ISO resolution chart we can measure absolutely no difference in resolution between the SD9 and SD10 using the same lens at (almost) the same aperture.