I use the X5 with stock lens and also M Zuiko lenses (17, 25 and 45mm) and have the settings as follow:
Sharpness -1
Contrast -1
Saturation -2
4K 25p & 1/50s, while keeping the ISO as low as possible (with Polar ND filters) in LOG. Downscale to 1080p and applying sharpening in post. Even the DJI...