Glass certainly matters... I think it'll attract people who want to retain their DSLR system and do a native R lens or two. Don't think anyone by and large will a true convert from competing systems. I'm excited about the optics more than the body. I'm good with DSLR for the foreseeable. Trying to upgrade my body in the near future. I have a tired 5Dii... put all my quatnus into glass (the holy trinity of 2.8 zooms). Gotta get a 35mm n 50mm prime. I really like Sigma.
I wonder if the Sigma will do Art lenses in this new R mount. That'd help bolster things considering their selection and popularity.
I Don't Need 15 Welts a Second