Fujifilm X-A10 has a
16.0MP APS-C (23.6 x 15.6 mm ) sized CMOS sensor . On the other hand, Olympus 5010 has a
14.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor and features TruePic III processor.
Another difference between these two cameras is that Fujifilm X-A10's sensor lacks anti-alias (Low-Pass) filter. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moiré occurring in certain scenes.
Below you can see the X-A10 and 5010 sensor size comparison.
As seen above, Fujifilm X-A10 has a 13.3x Larger sensor area than Olympus 5010. 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.