In spite of my recent Sony A7R IV headaches, I say without reservation that the Sony A7R IV is the best mirrorless choice on the market today in multiple ways. There might be purpose-specific exceptions to that (e.g., 8K video and a few other things), but I’d not look anywhere else for most purposes.
Many thanks to B&H Photo for expediting a Sony A7R IV to me, due tomorrow (Tuesday). With it, I can verify the 5 lenses that all appear to be “swung” on my Sony A7R IV, which is in for evaluation at Sony Pro Services. Please give B&H your business using any links from this site—they really make my work possible here! Don’t forget to use the B&H Payboo card to save sales tax in states like California. See also Sony FE 12-24mm f/2.8 GM Shootout @ 12mm vs Sony FE 12-24mm f/4 G: Big Tree at Creek Bend.
Does this $500 discount on the Sony A7R IV mean a Sony A7R V is coming? Not that I am aware of—no rumors for it. It looks more like a smart sales move.