Branded as the Z Ultra Google Play Edition, fans of the phablet-sized gadget can grab it running Android 4.4 by forking over $649 (about £394/AU$708). Unfortunately, the device is limited to the US Google Play Store for now.
The Z Ultra is identical to the Xperia Z Ultra Sony announced in June (not counting the inclusion of KitKat). The same whopping 6.4-inch screen with 1920 x 1080 resolution is there, and the Z Ultra maintains the original's slim 6.5mm-thick, 212-gram figure.
Inside, the smartphone packs a Qualcomm quad-core 2.2GHz processor with 2GB of RAM and 16GB storage. There is a spot for an external microSD/XC card slot.
The large phone also comes with a decent suite of cameras including an 8MP sensor on the back and 2MP front snapper for selfies. A 3,000mAh Lithium polymer battery keeps the Z Ultra Google Play Edition on task.
Playing with the big boys
In a race to cram the biggest phone in consumers' pockets, the Xperia Z Ultra is the largest, beating out its closest rival, the Samsung Galaxy Mega, by a mere 0.1-inches.
Of course the Play Edition of the Xperia Z Ultra holds an appeal for many as it runs stock Android 4.4. Not only does this mean it's not lacquered with bloatware, the handset is primed to receive updates quicker than non-Google Play Edition handsets.
Get daily insight, inspiration and deals in your inbox
Get the hottest deals available in your inbox plus news, reviews, opinion, analysis and more from the TechRadar team.
Kevin Lee was a former computing reporter at TechRadar. Kevin is now the SEO Updates Editor at IGN based in New York. He handles all of the best of tech buying guides while also dipping his hand in the entertainment and games evergreen content. Kevin has over eight years of experience in the tech and games publications with previous bylines at Polygon, PC World, and more. Outside of work, Kevin is major movie buff of cult and bad films. He also regularly plays flight & space sim and racing games. IRL he's a fan of archery, axe throwing, and board games.