Now here's something Android fanboys can go stick in the iPhone users face. AnandTech carried out a few benchmark tests which test a device in some key areas of its functioning. With the scores you can compare them to other devices which is what they did.
The main reason Galaxy Nexus topped the iPhone 4S was because of the software, Android Ice Cream Sandwich. Google did a fantastic job of optimizing the new version of Android wherever possible and making it take advantage of the Galaxy Nexus hardware.
From the graphs you can see the Galaxy Nexus tops all the latest device out there, even doubling the Samsung Galaxy S2.