When comparing Panasonic Lumix GH5 vs Sony A7S II, the Slant community recommends Sony A7S II for most people. In the question“What are the best 4K video cameras for low-light?” Sony A7S II is ranked 2nd while Panasonic Lumix GH5 is ranked 3rd. The most important reason people chose Sony A7S II is:
Due to the full-frame Exmor CMOS sensor, paired with BIONZ X image processing engine in the body, Sony A7S II can still be able to shoot high quality stills and footages with only just moon, stars, and a headlight on your head as your light sources, with minimal noise.
Specs
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Pros
Pro Great in-body image stabilization
With the Dual IS 2.0 In-Body Stabilization feature, taking footage handheld is a good experience since it reduces shakiness.
Pro Most capable in low light conditions
Due to the full-frame Exmor CMOS sensor, paired with BIONZ X image processing engine in the body, Sony A7S II can still be able to shoot high quality stills and footages with only just moon, stars, and a headlight on your head as your light sources, with minimal noise.
Pro Great built-in image stabilization
Thanks to the 5-axis image stabilization, the footage is stable and has very little shakiness, even when filming handheld or without a gimbal. The 5-axis image stabilization also works even with third-party lenses.
Cons
Con Average color in low-light
The color definition of the footage in low-light conditions does not get much better even after switching to a higher ISO setting, at up to its maximum 12800 ISO.
Con Limited display rotation
To be able to see what kind of picture/video you're taking/recording, a rotating LCD screen can be very useful. In this case, though, the LCD screen can only tilt upwards and downwards. Meaning it can be a bit difficult to see the preview.
Con Short battery life
With only a 1020 mAh lithium-ion battery, you might need more than one or two batteries for it to last a day, given the performance of the camera.