I've used the 5D mk iv which was considered pro, and found the EOS R to run circles around it, especially with EF glass like the 85mm 1.2 L in low light. I could also move focus in 1/3 the time. So even the EOS R is pro enough for the weddings and portraits I do. Would rather have two cards, but other than that, great camera.And the battery. Don't forget about the battery.
Most likely going to get an R5, but waiting for cost. I could probably get two EOS R for the price of one R5