Fujifilm Z33WP has a 10.0MP 1/2.3" (6.17 x 4.55 mm ) sized CCD sensor . On the other hand, Olympus XZ-2 iHS has a 12.0MP 1/1.7" (7.44 x 5.58 mm ) sized CMOS sensor .
Below you can see the Z33WP and XZ-2 iHS sensor size comparison.
As seen above, Olympus XZ-2 iHS has a 1.5x Larger sensor area than Fujifilm Z33WP. 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.