Only today Samsung have announced some new handsets at MWC that still run Gingerbread...
and all supported devices can get the update on release day by clicking a button.
Since iOS has no cross platform component similar to Android, it would make more sense to compare it to Google's Nexus OS or to Samsung's Galaxy OS.
I think the term "operating system" is so generic that it confuses a lot of people in these discussions. To many people and most tech journalists, the operating system is all software in a device before you install additional software. And by this definition, Android is not an operating system.
http://www.quora.com/What-proportion-of-all-iPhone-owners-us...
http://www.marco.org/2011/11/30/more-ios-device-and-os-versi...
for reference, iOS 5 was released October 12, Ice Cream Sandwich on October 19.