Hi, just to report back on my trip.
Up to the last minute I kept my options open, as I had enough space, and baggage weight would not have been a problem, but in the end decided to go with just the Canon G7xii, and how glad I am in the end about that decision.
First of all we walked an average of 10km per day for 2 weeks. The last 5 days in Lisbon with it's "hilly" streets, was a bit difficult, but we made it and overall had a memorable experience.
As a first trip into the unknown, we made use of a lot of "free tours" to the most visited tourist spots, and in both Spain and Portugal, I was astounded at the volumes of tourist around.
The problem of "seeing" a place in this way, is that you don't really have any time to make or take great images, it is more a record of events to reflect upon, once you are back home and settled into the everyday routine.
In all I took about 3000 photos, with the Canon and my mobile phone, and mostly in daytime, and I'm quite satisfied with the camera performance. I do not think carrying around another 1.5kg would've improved the quality of any of the images I took.
Looking around, I saw a majority of Canon DSLR's, and interestingly, with young people using them, obviously teens and a bit older. The few Sony mirror-less, and other compact and smaller bridge cameras, were mostly used by older people.
The only real find was meeting a gentleman from the States, with a Rollei camera, which he apparently bought just before his trip, busy quietly sitting on his spot, taking some shots, would've loved to see the results, but the fleeting moment didn't allow for exchange of details.
I have not had a chance to go through all my shots, but after visiting these old cities with very narrow streets and massive old buildings, would guess that probably 90% of my shots were in the 24-50mm range, with the others zoomed to get more detail of certain aspects in the old buildings.
Thanks for all the tips before, and looking at the outcome