If you are using the default Sony Xperia Z3 keyboard to type, you may find the Vibration on keypress feature somehow annoying. To turn off and disable vibration while typing on Xperia Z3 do as follows:
1. Open Settings and under the Personal settings, go to Language & Input.
2. On the list of available keyboards and input methods, find the Xperia keyboard and tap the Settings icon right to it
3. Scroll down to the end and tap the Sound and Vibration option
4. To disable vibration, simple unmark the "Vibration on keypress" option