According to a recent rumor, with the future firmware update Panasonic GH5 will be able to offer up to 20 frames/s in RAW. Well, if it happens so that it could be very nearly to match the Current Sony A9 that already capable of shooting up to 20 fps is supported for up to 362 consecutive JPEGs, or 241 raw frames.
Panasonic is working on a GH5 high speed burst mode. It will also offer up to 20 frames/s in RAW!
You can click here to see specification comparison, best lenses and other accessories for Panasonic GH5.