Just how thin is 7.1mm? Well, we could tell you (been there, done that), or we can show you. And what better way to really drive the point home than with some head-to-head shots? We busted out our trusty iPhone 4 and the lead brick that is the first-generation Motorola Droid for good measure. And heck, we had the LG Marquee and Droid Incredible 2 floating around, so we threw those into the mix, as well. So, who's the thinnest of them all? Find out in the gallery below.