It's not the only phone to shoot 4K video. It's just the only one that can play it back natively. The screen of the Sony Xperia Z5 Smartphone measures 5.5 inches, yet packs in full 4K Ultra HD resolution, making it the sharpest, highest-resolution display you'll find on a phone. The camera is similarly impressive, with a Sony-made 23 megapixel sensor, Hybrid Autofocus that can lock on to your subject in as little as 0.03 seconds, and a bright f/2.0, 24mm wide-angle lens. Other features include 4K video capture (obviously), an integrated fingerprint sensor for added security, and a battery that lasts for up to two full days.