When using touch controls on my phone looking on the Y-Axis seems to move faster than looking on the X-Axis. This seemed to be consistent across all levels of sensitivity.
Edit: This bug seems to be a cause/duplicate of MCPE-22136
First, Turn your sensitivity low so you can easily see the bug. Look around on the X-Axis then Y-Axis. You should notice the Y-Axis moving across faster then the X-Axis.
|Destroy Block (Vibrate)||True|
|Swap Jump and Sneak||False|
|Touch only affects hotbar||False|