Sony HX100V has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features BIONZ processor. On the other hand, Panasonic ZS99 has a
20.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features Venus Engine processor.
Below you can see the HX100V and ZS99 sensor size comparison.
Sensor Size and Resolution Comparison image of Sony HX100V and Panasonic ZS99 Cameras
Sony HX100V and Panasonic ZS99 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.
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
Sony HX100V
or the
Panasonic ZS99 ,
including hyperfocal distance.