Take a look at Bryn North's youtube channel. He has one video with Matt Hunter in Madeira. Pretty sure he used a GH5 and his parter a 1DX ii. They used to do a bunch of videos for Specialized's athletes. I know cause my better half is one, so I hung around Bryn and Etienne for a while. They would always go light and stealth with a GH5 & 1DX ii and do amazing stuff