Both Panasonic G85 and Fujifilm X70 have 16.0 MP resolution sensors but Panasonic G85's sensor is Four Thirds (17.3 x 13 mm ) and Fujifilm X70's sensor is APS-C (23.6 x 15.6 mm ).
Since Fujifilm X70's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Panasonic G85.
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 moiré occurring in certain scenes.
Below you can see the G85 and X70 sensor size comparison.
As seen above, Fujifilm X70 has a 1.6x Larger sensor area than Panasonic G85. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.