Sony Mobile has begun to rollout a new firmware update for the Xperia X and Xperia X Compact, moving it from build number to 34.3.A.0.244 version 34.3.A.0.252. Sony has a great track record of getting security updates out faster than most other manufacturers. The same applies here, with these handsets receiving the 1 December 2017 Android security patch. If you have downloaded thee update let us know your impressions in the comments below.
Thanks Pasca, Peter and SonyXperiAilesi!