YI M1 has a
20.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor . On the other hand, Olympus E-PL5 has a
16.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor .
Below you can see the M1 and E-PL5 sensor size comparison.
Sensor Size and Resolution Comparison image of YI M1 and Olympus E-PL5 Cameras
YI M1 and Olympus E-PL5 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 Olympus E-PL5 has 26% larger pixel area (14.12µm 2 vs 11.16µm 2 ) compared to YI M1, 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
YI M1
or the
Olympus E-PL5 ,
including hyperfocal distance.