Olympus E-M5 III has a
20.0MP Four Thirds (17.4 x 13 mm ) sized MOS sensor and features TruePic VIII processor. On the other hand, Olympus E-M10 II has a
16.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features TruePic VII processor.
Below you can see the E-M5 Mark III and E-M10 II sensor size comparison.
Sensor Size and Resolution Comparison image of Olympus E-M5 III and Olympus E-M10 II Cameras
Olympus E-M5 III and Olympus E-M10 II 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
Olympus E-M5 III
or the
Olympus E-M10 II ,
including hyperfocal distance.