The company Lenovo seems to take care of their customers. They are offering Android 4.4.2 Kitkat update for Lenovo Vibe Z. As per the source a Malaysian user got the Android 4.4.2 Kitkat update over the air.
Lenovo Vibe Z Kitkat update
You can read more about Lenovo Vibe Z. So this 5.5 inch smartphone will get a heavy update. Yes it is heavy because it has a massive size of 1.2 GB. So do keep sufficient space in your smartphone to accommodate this update. We hope that users will enjoy software optimizations and features with this update.
The update can be seen in the taskbar of the Lenovo Vibe Z. As it is of very large size we recommend the user to update via a Wi-Fi network. Let us know your experience after the update in the comments below.