Both Panasonic G7 and Panasonic G85 have Four Thirds sized 16.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Another difference between these two cameras is that Panasonic G85's sensor lacks anti-alias (Low-Pass) filter. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moire occurring in certain scenes.
Below you can see the G7 and G85 sensor size comparison.
Panasonic G7 and Panasonic G85 have sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture.