Sony have begun rolling out a minor software update for the Sony Xperia Z Ultra. 
The update for the Sony Xperia Z ultra includes:

  • optimized touchscreen sensitivity, for both finger gestures and writing / sketching with pencils, metal pens and selected styluses
  • re-calibrated display to ensure viewing experiences remain bright & bold
  • economised power consumption for longer battery life
  • streamlined Exchange connection for faster email sync, display and download
Let us know if you've received the update and noticed any differences.
Source: Sony Mobile

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