Ah, we're both new parents! Congrats! I also thought of the R5/R6, but decided the RP was perfect and under $1000! I also wanted f/1.2 lenses and that's why I switched from the Z. Canon's EF f/1.2's are stellar and considerably better than Nikon's adapted f/1.2's.Yep, ~1.6” longer and 0.3 pounds heavier if I did my math correctly. The canon is a few hundred more and 0.04” thicker. Another notable difference is the canon has a close focusing distance of 1.3” while the Nikon is 1.5”
I’ve thought long and hard about moving over to Canon simply because of lens size (70-200mm RF in particular compared to the 70-200mm Z). I like using the Z and wasn’t ready to sell it and switch systems right before a huge stressor in my life though (second child and taking care of a newborn in a pandemic).
Thought about buying a R6 and the canon anyway, but that seemed more ridiculous to me than dealing with the extra size of the 1.2s, plus my wife said she didn’t want too many different camera bodies laying around haha (lately weve had her Fuji X-A7, the Z6, and the M10 Monochrom out and about).