Casio EX-Z29 has a
10.0MP 1/2.5-inch (5.744 x 4.308 mm ) sized CCD sensor . On the other hand, Casio EX-ZS5 has a
14.0MP 1/2.3-inch (6.16 x 4.62 mm ) sized CCD sensor and features Exilim Engine 5.0 processor.
Below you can see the EX-Z29 and EX-ZS5 sensor size comparison.
As seen above, Casio EX-ZS5 has a 1.2x Larger sensor area than Casio EX-Z29. 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.