The two flagship smartphones from the folks over at Sony Mobile would be the Sony Xperia Z and Xperia ZL, and it is rather encouraging to see that Sony intends to make sure that the Xperia Z and Xperia ZL will be able to last as long as possible in the market without being too outdated – at least in terms of its software (you can’t do much about the hardware once the device has been released to the masses). New firmware updates for both devices will deliver similar improvements, including signal and touch sensitivity and its fair share of bug fixes, although you should take note that it has nothing to do with an operating system upgrade, so do expect it to remain under the Android 4.2.2 Jelly Bean domain for now.
While no official change log is available concerning the firmware updates for both devices, some users have claimed that the boot animation is smoother than before, while RAM management is more efficient. Other than that, 3G signal strength has improved, with a faster sleep and wake time among others. Of course, some of these listed are subjective and depends on your mobile carrier as well as signal strength, so do take it with a pinch of salt. You can get these updates via over-the-air or through the Sony PC companion. [Xperia ZL Firmware Update Link and Xperia Z Firmware Update Link]