Thanks to Dave the Mobile Sage, he sent this website (mixpanel) that tracked iOS adoption. Specifically, iOS 7 is what we're interested in. In less than 24 hours, it's already at 1/3 of the iOS market.
That's fast. Can you imagine this kind of adoption for any other platform. Certainly not Android and, even with closed ones like Blackberry, Web OS, or Windows Phone, you can't get this kind of adoption rate.
It's good for the platform. Great for the end users. And all around high-fives for developers.