People are funny talking about overheating. The camera is obviously not going to have that issue as they already addressed it in the R5/6.
People forget, when the R5 came out, it was a huge leap and the best offering. It wasn't until Sony came out of nowhere with the A7S III, packing it full of features. This is understandable as they were the underdog.
Now that they're not the underdog anymore, the pricing is relatively the same as Canon with even, what I would argue, even more milking of their customers. Don't forget, there is no competition for their express cards so they charge top dollar. $2500 for a pair when an even faster pair for Canon, the same size, is $400 - $600. Add in disappointing releases and now the A7R V, that is literally a Canon R5 from two years ago for the same price (even more expensive because you can get the R5 cheaper used now), and we no longer have this "no brainer" situation. In-fact, the R5 is actually better in a few regards. So much for that "AI autofocus".
As someone who was torn between both systems, I am staying with Canon and all it would take is for the R6 MKII to be a C version of the R6, unlocking some video features along with the other leaked additions, and it's a wrap. If it has the R3 sensor and turns out to be a mini R3? It will simply be the best camera, beating out some more expensive Sonys, not including the ridiculous cost of express cards.
I don't know why, but I still feel people riding the Sony bandwagon. It's time to hop off and come back to reality and stop being overly harsh on everything Canon yet giving Sony a pass for mediocrity and/or putting fancy names on features Canon already had like better IBIS and auto focus.