Fujifilm X-M5 has a
26.0MP APS-C (23.5 x 15.6 mm ) sized X-Trans CMOS 4 sensor and features X-Processor 5 processor. On the other hand, Ricoh GR IIIx HDF has a
24.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor .
Another similarity between these two cameras is that both Ricoh GR IIIx HDF and Fujifilm X-M5 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 X-M5 and GR IIIx HDF sensor size comparison.
Sensor Size and Resolution Comparison image of Fujifilm X-M5 and Ricoh GR IIIx HDF Cameras
Fujifilm X-M5 and Ricoh GR IIIx HDF 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. On the other hand, since Ricoh GR IIIx HDF has 8% larger pixel area (15.28µm 2 vs 14.12µm 2 ) compared to Fujifilm X-M5, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.
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-M5
or the
Ricoh GR IIIx HDF ,
including hyperfocal distance.