Olympus E-M10 II has a 16.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features TruePic VII processor. On the other hand, Fujifilm GFX 100S has a 102.0MP Medium format (44 x 33 mm ) sized BSI-CMOS sensor and features X-Processor 4 processor.
Fujifilm GFX 100S's sensor provides 86MP more than Olympus E-M10 II's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the E-M10 II and GFX 100S sensor size comparison.
![Olympus E-M10 II vs Fujifilm GFX 100S Sensor Size Comparison]()
Sensor Size and Resolution Comparison image of Olympus E-M10 II and Fujifilm GFX 100S Cameras
As seen above, Fujifilm GFX 100S has a 6.5x Larger sensor area than Olympus E-M10 II. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.