Sony's latest updates for Xperia Z and ZL have improved the performance of both the devices. The update is based on Android 4.2.2. Some of the enhancements in this update are:
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- More smooth Boot animation
- Efficient RAM management
- Home launcher is smoother, no more lag
- Update Center has new UI
- 3G Signal strength improved
- Touch response is improved a lot
- Faster sleep and wake
- Low-light image quality improved
- Changes in car mode app
- High resolution image snapping while recording a non-HDR video
- No screen flickering
- No unusual battery reading bug