I can't comment on the Sony, but had a S9100 and didn't care for it.
If you're just taking general snapshots and don't make big prints, it's fine. It has a great list of features but in real world usage they don't perform well consistently. Focus in normal room lighting was constantly hunting even with the assist.
I think you'll have a difficult time using it for the stringent noise requirements for stock. Even when I shot at ISO80 I saw faintly visible shadow and dark area noise when the image was fit to the monitor. When I viewed the image at 100% I was pretty surprised with the amount of noise in darker areas.
Again, a casual shooter who is moving up from a P&S will probably love it. If you have owned a DSLR you may find its performance is closer to a P&S than a DSLR. But then again, I'm pretty picky.