New firmware updates are now available for the Sony Xperia Z and Xperia ZL. Both new ROMs bring similar improvements over the system, signal and touch sensitivity, bug fixes and are still based on the Android 4.2.2 Jelly Bean. There is no official change log on the updates, but some users have already compiled a list of all the notable changes. More smooth Boot animation Efficient RAM...
Source: http://www.gsmarena.com/sony_updates_xperia_z_and_xperia_zl_improves_performance-news-6498.php
