All this shows is web usage statistics from a single company measuring it. It makes total sense for countries like India where the phone is very often the only means of connecting to the internet where looking at mobile web statistics may well be the actual usage pattern. And it also makes sense that in those countries, the iPhone is going to be at the losing end drastically because of price.
But it makes no sense to conflate web usage with phone sales in developed nations. It never failed to amaze me that many of my iPhone toting friends used their tiny 3.5" devices to surf the web when they had a PC in front of them. In spite of excellent 5" screens on my Android devices, I always preferred to use my 27" monitors for browsing. With multiple tabs and large real estate and quick navigation and better keyboard (not withstanding the excellent SwiftKey), it always seemed idiotic to me.
I dumped my iPhone (much better hardware) for the G1 and since then have always purchased flagship Android phones sometimes more expensive than the iPhones (Note 2). I'm not an outlier - as the IDG report shows.