There's also some notable new imaging tech, Sony's 13-megapixel Exmor RS sensor.

ENGADGET: Sony Xperia Z: hands-on with the new flagship at CES 2013 (video)

The smartphone shares capabilities with Sony digital cameras and features Exmor RS for mobile, the world's first image sensor with HDR (High Dynamic Range) video for smartphones.

ENGADGET: Sony Xperia Z announced: HDR video capture, 5-inch 1080p Reality Display, water-resistant

Improvements to the Xperia line aren't merely cosmetic, though: Sony's added a 13-megapixel camera (featuring the HDR video-capable Exmor RS sensor) and a 1.5GHz quad-core Snapdragon S4 Pro -- Qualcomm's most potent mobile processor currently available.

ENGADGET

Sony has been actively promoting the future, the expansion of the product mix and technological development of CMOS image sensor "Exmor RS" stacked core technology to evolve products, digital imaging, spread the enjoyment of photography easier to use, which is a device Go.

ENGADGET: Sony announces new Exmor RS cameraphone sensor: upgraded signal processing, HDR video recording