Samsung WB350F has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor . On the other hand, Panasonic ZS20 has a
14.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CMOS sensor .
Below you can see the WB350F and ZS20 sensor size comparison.
Sensor Size and Resolution Comparison image of Samsung WB350F and Panasonic ZS20 Cameras
Samsung WB350F and Panasonic ZS20 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
Samsung WB350F
or the
Panasonic ZS20 ,
including hyperfocal distance.