Panasonic FZ80D has a
18.0MP 1/2.3 (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features Venus Engine processor. On the other hand, Panasonic FZ300 has a
12.0MP 1/2.3 (6.17 x 4.55 mm ) sized CMOS sensor and features Venus Engine processor.
Panasonic FZ80D's sensor provides 6MP more than Panasonic FZ300's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the FZ80D and FZ300 sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic FZ80D and Panasonic FZ300 Cameras
Panasonic FZ80D and Panasonic FZ300 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 FZ300 has 49% larger pixel area (2.34µm 2 vs 1.56µm 2 ) compared to Panasonic FZ80D, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.
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 FZ80D
or the
Panasonic FZ300 ,
including hyperfocal distance.