Hi DOUBLEH.,
I don't know if your question is still active or not? But, I own a Sony RX100-VI, along with a Nauticam Housing, CMC-1 Macro lens and the Nauticam WWL-1 Wide Angle Wet Lens. The specs between the Sony RX100 V & VI are close to being the same. The big improvements were with the ISO Range, more focus points and the lens going from a 70mm to 200mm telephoto!. With the Nauticam standard port you can use the full telephoto range and with the use of a CMC-1 macro wet lens, can get down to extreme macro! Above water the 200mm telephoto makes the Sony a great all around travel camera. I shoot birds, other wildlife, rock concerts and car racing with it!! Hope this helps?