CES wrapped just two weeks ago, and already, the gadgets announced there are starting to arrive on our review desk. First up, Sonys Xperia Z1S, a modified version of the waterproof Z1 we tested last year, complete with a 20.7-megapixel camera. Only this time, the phones being sold exclusively on T-Mobile — at least here in the US, anyway. So how does it stack up? Our own Joseph Volpe spent a week with one to find out.