Sony WX500 has a
18.0MP 1/2.3 (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features Bionz X processor. On the other hand, Kodak Astro AZ651 has a
21.0MP (1/2. ) sized CMOS sensor .
Below you can see the WX500 and Astro AZ651 sensor size comparison.
As seen above, Sony WX500 has a infx Larger sensor area than Kodak Astro AZ651. 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.