Sorry for starting up another GH5 thread but figured this could focus on test footage/your first go with the camera. Here's mine - got it today, had 10mins of light left after work so took the kids to the park.
A mix of 4K 50p and 180fps VFR, daylight WB, iso 200, Sigma 50mm on Speedbooster XL, Natural profile. Shot mainly wide open. No ND filter so controlled exposure with high shutter speed.
PRO's so far: Options galore, amazing build, EVF/LCD= amazing. Picture looks GOOD! IBIS = inc