Canon R6 III has a
32.5MP Full frame (36 x 24 mm ) sized CMOS sensor and features Digic X processor. On the other hand, Sony FX2 has a
33.0MP Full frame (35.8 x 23.8 mm ) sized BSI-CMOS sensor and features Bionz XR processor.
Below you can see the R6 III and FX2 sensor size comparison.
Sensor Size and Resolution Comparison image of Canon R6 III and Sony FX2 Cameras
Canon R6 III and Sony FX2 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
Canon R6 III
or the
Sony FX2 ,
including hyperfocal distance.