Panasonic G6 has a
16.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor . On the other hand, Panasonic G100 has a
20.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor .
Below you can see the G6 and G100 sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic G6 and Panasonic G100 Cameras
Panasonic G6 and Panasonic G100 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 G6 has 26% larger pixel area compared to Panasonic G100, it has potential to collect more light on pixel level hence 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 G6
or the
Panasonic G100 ,
including hyperfocal distance.