Fujifilm Z33WP has a 10.0MP 1/2.3" (6.17 x 4.55 mm ) sized CCD sensor . On the other hand, Fujifilm X30 has a 12.0MP 2/3 (8.8 x 6.6 mm ) sized CMOS X-TRANS II sensor and features EXR Processor II processor.
Below you can see the Z33WP and X30 sensor size comparison.
As seen above, Fujifilm X30 has a 2.1x 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.