How does it compare to the GH5S?

It’s easy to assume that a large sensor camera simply offers better image quality, which is mostly recognizable through less noise in the shadows, but also tends to mean cleaner tones across the whole image. But depending on which of the camera’s modes you use, this may not be the difference you experience.
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https://www.dpreview.com/reviews/panasonic-lumix-dc-s1h-review-in-progress/7