There is unique feature on the Xperia Z3 which lets you specify which icons to show on the status bar. For example you can hide / show battery icon, battery percentage, or time.
To customize status bar on Xperia Z3 (and of course Xperia Z3 compact) do as follows:
1. Open Settings and go to Personalization.
2. Tap the "Status bar icons" option
3. Now you can easily specify the system icons you would like to see on the status bar. Available options are: Alarm, Battery, Battery percentage, STAMINA, Bluetooth, Time, Silent mode,Wi-Fi, and Location