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Video is a bit of a disaster on the Sony Xperia U. Despite being technically rated as 720p capable, the sensor's simply not up to the job.
There's a huge amount of blockiness and digital mess on our clips, with some darker areas of the images resembling nothing more than a few rough, black squares.
In decent light when nothing's moving it does a slightly better job, but you won't really want to be recording too many of life's magic moments with the Sony Xperia U.