Outside of Google, it looks like Sony is the first company to start pushing 4.4.4 to its devices, beginning with the Z1, Z1 Compact, and Z Ultra. While it's only a very minor update, it still says something about Sony's drive to push timely updates that it's the first to get 4.4.4 out the door to consumer devices.

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Included in this software

There are many improvements in this upgrade for your Xperia™ smartphone, some examples are:

  • Android 4.4.4 including the latest enhancements and security updates from Google
  • Updated and improved camera experience
  • Improvements when using Google voice, Contacts, Music streaming and Google+
  • The latest versions of our Sony apps for you to enjoy
  • All of our latest bug fixes, optimisations & improvements

The update is currently only rolling out in Europe, but it will likely follow in other regions fairly soon.

[Sony: Z1, Z1 Compact, Z Ultra]