Panasonic ZS30 has a
18.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CMOS sensor . On the other hand, Panasonic ZS35 has a
16.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CMOS sensor .
Below you can see the ZS30 and ZS35 sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic ZS30 and Panasonic ZS35 Cameras
Panasonic ZS30 and Panasonic ZS35 have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Panasonic ZS30
or the
Panasonic ZS35 ,
including hyperfocal distance.