Both Fujifilm X-Pro3 and Sony A6700 have APS-C sized 26.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Another difference between these two cameras is that Fujifilm X-Pro3'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 X-Pro3 and A6700 sensor size comparison.
Sensor Size and Resolution Comparison image of Fujifilm X-Pro3 and Sony A6700 Cameras
Fujifilm X-Pro3 and Sony A6700 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
Fujifilm X-Pro3
or the
Sony A6700 ,
including hyperfocal distance.
