Perhaps people are planning to get Android devices but would love an iPhone if it was the same price. It's the same with cars. If you surveyed people most would say they plan to get a Toyota, but only because Ferrari is outside their price range.
It has been argued for years that pitting Android against the iPhone is unfair because Android comes in so many devices at many price points whereas the iPhone is just that--the iPhone. There are just two models (the previous, and the current. It used to be just one until 2 years ago.), one hardware spec (with varying memory sizes, sure).
But that's the game Apple chose to play. They intentionally crippled themselves (even if they don't think so), so this is really a comparison of Apple's strategy vs. Google's strategy. And Google's strategy seems to be winning in some aspects.
Both strategies are winning given their specific (and different) goals.
http://www.att.com/wireless/iphone/
Another thing you didn't mention is that none of the iPhones to date are 4G, and many of the new Android devices are