You asked

Is the panasonic gh6 good for filmmaking?

Yes, the Panasonic Lumix GH6 is a strong pick for filmmaking. It's described on its page as a video body, with internal ProRes and a fan for long recording. Its Micro Four Thirds sensor frames at 2x, so a 25mm lens acts like a 50mm on full frame. Check the GH6 page for the specs you care about most, since my notes don't confirm its full-width 4K, 10-bit recording, or headphone jack.

For filmmaking, I'd look at what a video body needs first, then pair it with lenses that keep exposure steady as you zoom. Good options from the GH6 list:

You'll also need ND filters to hold a sensible shutter speed in daylight. The sensor guide explains why the smaller Micro Four Thirds frame gives you more depth of field at the same focal length.

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