Detailed comparison of the Panasonic GH5s vs Sony A7S II. You can find high ISO comparison test with key specifications in this post.

The Panasonic Lumix DC-GH5s and the Sony Alpha 7S II are two high-end video centric cameras that were announced, respectively, in January 2018 and September 2015.

The Panasonic GH5s will be available from February for $2499 body-only.

Coming back to sensor resolution, Both the GH5s and the A7S II are mirrorless interchangeable lens cameras that are based on a Four Thirds (GH5s) and a full frame sensor. The Panasonic has a resolution of 9.9 megapixel, whereas the Sony provides 12 MP.
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http://www.mirrorlesstimes.com/2018/01/panasonic-gh5s-vs-sony-a7s-ii-high-iso-comparison/