Ricoh GR IV Monochrome has a
26.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor . On the other hand, Nikon D3200 has a
24.0MP APS-C (23.2 x 15.4 mm ) sized CMOS sensor and features Expeed 3 processor.
Another difference between these two cameras is that Ricoh GR IV Monochrome'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 GR IV Monochrome and D3200 sensor size comparison.
Sensor Size and Resolution Comparison image of Ricoh GR IV Monochrome and Nikon D3200 Cameras
Ricoh GR IV Monochrome and Nikon D3200 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
Ricoh GR IV Monochrome
or the
Nikon D3200 ,
including hyperfocal distance.