Sony has just started rolling out the Android 5.0.2 Lollipop to a bunch of recently released Xperia devices including Xperia Z, Xperia ZR, Xperia ZL and Xperia Tablet Z. This update has a built number 10.6.A.0.454 and it is available as an over the air update (OTA).
According to the Sony Xperia Blog, Xperia users in Hong Kong can now download the Android 5.0.2 Lollipop update via OTA for Xperia Z (C6603 and C6616) and Xperia ZR LTE variants (C5503). On the other hand, Xperia Z and ZR LTE models OTA updates are now available for manual download via PC Companion. As usual, it may take a few days or even a week or two for you to see the updates on your device.