Originally posted by Pentaxor Sony seems to do a great job with their own sensors, but personally I prefer what the Foveon sensor could offer.
Agreed. IMO, Foveon should have been the standard sensor layout by now, it just hasn't had the R&D funds to back it like Bayer. It's sad when business reasons displace a superior product, but alas it's the world we live in.
I'm rooting for Sigma on this one; perhaps the SD1 will be the barrier breaker to get other companies (Sony/Samsung) interested in buying licensing or coming up with something better. I'm sure the ISO noise problems would be reduced over time with a proper R&D budget (sheesh, even on Sigma's budget the noise levels have halved on the SD1 vs the SD15 with 3x more pixels! src: Carl Rytterfalk's latest blog post).
As far as damaging 645 sales, I think it's unlikely. Sigma DSLRs are still primarily an enthusiast only market. I imagine most 645 owners are pro's and aren't willing to risk buying into the SA lens mount with so many more established lenses under Pentax.