Olympus FE-4030 has a 14.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor and features TruePic III processor. On the other hand, Fujifilm F800EXR has a 16.0MP 1/2-inch (6.4 x 4.8 mm ) sized EXRCMOS sensor and features EXR processor.
Below you can see the FE-4030 and F800EXR sensor size comparison.
As seen above, Fujifilm F800EXR has a 1.1x Larger sensor area than Olympus FE-4030. 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.