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Xperia Z3 is capable to record video in 4K or in other word "Ultra High Definition" in the resolution of 3840 X 2160p. Open the Camera's app drawer and select the 4K app to record the video in 4K. It's main purpose is to record the videos in 4K so that people can share their videos by connecting to it to a 4K TV.
Hope this helps. 