Note 3 is the only smartphone which is capable of recording 4K videos right Now. Recently XperiaBlog leaked the screen shots of Sony's next flagship smartphone model number D6503 codename Sirius. The screenshots not only tell that the device is running android 4.4.2 KitKat but also suggest 4K video recording feature. These leaked images also show the homescreen and user interface. the smartphone will also bring some new features like Timeshift video, Smart backlight control, two home launchers, USB DAC support etc. 

              

There is no confirmed release date of the Sirius but it is expected to show up at MWC 2014. Head over to the Xperia Blog to see full screen shots and some smartphone design leaks..

Source: XperiaBlog