Panasonic G100 has a
20.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor . On the other hand, Panasonic GH4 has a
16.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features Venus Engine IX processor.
Below you can see the G100 and GH4 sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic G100 and Panasonic GH4 Cameras
Panasonic G100 and Panasonic GH4 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 Panasonic GH4 has 26% larger pixel area (14.12µm 2 vs 11.16µm 2 ) compared to Panasonic G100, 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
Panasonic G100
or the
Panasonic GH4 ,
including hyperfocal distance.