Both Leica M8.2 and Leica M8 have APS-H sized 10.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Another similarity between these two cameras is that both Leica M8 and Leica M8.2 sensors lack anti-alias (Low-Pass) filters. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moiré occurring in certain scenes.
Below you can see the M8.2 and M8 sensor size comparison.
Sensor Size and Resolution Comparison image of Leica M8.2 and Leica M8 Cameras
Leica M8.2 and Leica M8 have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture.
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Leica M8.2
or the
Leica M8 ,
including hyperfocal distance.