Both Pentax K-70 and Fujifilm X-Pro2 have APS-C sized 24.0 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 Fujifilm X-Pro2 and Pentax K-70 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 K-70 and X-Pro2 sensor size comparison.
Sensor Size and Resolution Comparison image of Pentax K-70 and Fujifilm X-Pro2 Cameras
Pentax K-70 and Fujifilm X-Pro2 have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the 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
Pentax K-70
or the
Fujifilm X-Pro2 ,
including hyperfocal distance.
