Olympus 1s has a 12.0MP 1/1.7" (7.44 x 5.58 mm ) sized BSI-CMOS sensor . On the other hand, Fujifilm HS35EXR has a 16.0MP 1/2" (6.4 x 4.8 mm ) sized EXRCMOS sensor and features EXR processor.
Below you can see the 1s and HS35EXR sensor size comparison.
As seen above, Olympus 1s has a 1.4x Larger sensor area than Fujifilm HS35EXR. 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.