Panasonic ZS3 has a
10.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor . On the other hand, Leica V-Lux 30 has a
14.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CMOS sensor and features Venus Engine FHD processor.
Below you can see the ZS3 and V-Lux 30 sensor size comparison.
Panasonic ZS3 and Leica V-Lux 30 have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture. On the other hand, since Panasonic ZS3 has 40% larger pixel area compared to Leica V-Lux 30, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.