>>4301962Try to get your hands on one in person to see if it's even comfortable. I've never liked any canon's ergonomics that I've gotten my hands on and played around with in stores and you might feel the same way about sony.
That being said, these things have so much tech packed into them it's astounding. You have to actively try to fuck up missing focus on people and animals. Even with the revamped and "simpler" menus it can be a little daunting with just how much shit you can change and customize but if you're willing to take a couple hours to set your menus and controls to your liking then you'll have a great user experience.
You'll probably want the zeiss 35mm 2.8 or sony 40mm 2.5 for your compact prime. Those are about as small as you'll get, the only "true" pancake lenses are the 16mm which I've heard is shit and the 20mm which is considerably wider than the 35mm you want. The only decent stabilized standard zoom is the tamron 17-70mm which is kinda bulky and doesn't sound like what you want for a compact system. The ibis is good enough that you don't really need stabilization in the lens and you should probably get the sigma 18-50 instead.
If the fancy tech and good af is what you're after the r7 might also be worth considering since you already have ef glass. It's a bit bigger but the a6700 isn't exactly a "small" camera either. Smaller than your 5d but it's no xv100 or griii.