I am upgrading from the 5D4 as well but I am much more excited about other aspects. The RF lenses are amazing, I tested out my new 85 1.2 DS the other day and it hits focus so much more reliably than the EF 1.2 - I am also moving to the 28-70 f2 for events (24-70 2.8 II was on my camera 90% of the time) and this new lens feels like a mix of that lens with portrait lens perks
dual card slots, IBIS, eye tracking / animal eye tracking , RF mount, and significantly faster cards are all reasons to be very happy! From what people are saying it is going to be 44.7 Megapixels (as video ratio different to photography ratio) anyway