Panasonic GF7 has a
16.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features Venus Engine processor. On the other hand, Panasonic GF5 has a
12.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features Venus Engine FHD processor.
Below you can see the GF7 and GF5 sensor size comparison.
Panasonic GF7 and Panasonic GF5 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 GF5 has 31% larger pixel area (18.74µm2 vs 14.21µm2) compared to Panasonic GF7, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.