Now I remember...
FOCUS Hunting:
Someone mentioned about when they focus, the camera will look like it is hunting (focusing back and forth).
All Panasonic camera use "Contrast Detection" AF.
Sony, Canon, Nikon and others use this technology on some other their cameras, but most other their cameras also have a "Phase Detection" type of AF. A much better AF technology.
Contrast AF will estimate the distance of an object, overshoot and undershoot the focus distance and then redo it over an over again, in nanoseconds (?) but each time over/undershot less and less of a distance from the object until it nails it. That is why you see that weirdness as it focuses.
Canon uses dual pixel AF (a type of Phase Detection). Each pixel has 2 sides (a diode in each) that samples object (and I am guessing uses parallax angle measurement) to figure out the distance it needs to focus at and WAH-POW! - it just focuses just once, right to that distance.
I may not have explained all this 100% correctly, but you can google "Phase Detection Auto Focus", and "Contract Detection Auto Focus" and "Canon Dual Pixel Auto Focus" to get it more accurately explained. On the camera forums, video guys LOVE the Panasonic camera, as long as their workflow doesn't rely too much on Auto Focus.
I have at least 2 cameras from each brand and feel:
Sony: Great technology, bad ergonomic and menus and not fun to use.
Canon: great tech (pretty close, some say as good), great ergonomic, great menu system, fun to use.
Panasonic: bad AF, great menu system, best options for changing size of one spot focus (but again, not so good AF). I have to use the EVF to make sure I got focus nailed.