kwahlgren:
DougMac and Andrew -- true, it's definitely worth considering how much equipment I'll want to lug around -- especially in mid-August! If I bring my Mark3, I was just going to bring a 24-70 lens, and maybe a 50mm as backup. But the G7Xii is itty-bitty and shoots RAW, and while I'm a bit slower with it (because I use it less than the Mark), it's a totally capable camera and takes a good 5 or 6 lbs out of my bag. On the other hand, my anxious side wants the dual card slots on the Mark so I don't lose all these travel photos to a corrupt card. Aggggghhh, gear decisions. But at least now I feel like I can take any worries about theft out of the equation!
FYI, when I traveled with my Canon gear, I carried both my 17-40mm wide, 24-105mm middle range, and 70-200mm (with 1.4X extender), and I used ALL of them from time to time - mostly the 24-105mm, but I used especially the 70-200mm quite a lot. I missed having such a zoom on one trip (when my old 100-300mm zoom broke) and have never been without one again.
Since moving to the Lumix (effective 25mm-400mm), I've been surprised how much I use the 400mm zoom. (I also at 25mm often too - so I shoot a variety of wide and tight zoomed shots.) And the quality at 400mm is much better than I expected; the camera has a great image stabilization system that works better than the Canon (in-lens) system. I do occasionally miss the 17-40mm wide angle sometimes. And I miss not being to stop down past f/8(!). But, I learned to live with these compromises and still get a lot of great shots with the Lumix.
So is it possible you might consider buying a better bridge camera instead of G7Xii? I see it is no slouch (1" sensor) - but are you familiar with its limitations vs. your Canon DSLR? Have you really used it as more than a simple P&S camera? I had to learn what the limitations of my Lumix were vs. the Canon - once I learned them I was able to adjust somewhat. The G7Xii looks so small. The 24-100mm range would be just too limited for me...