I'm NOT switching to a Sony A7R iv (but Tony is?)

Tony and I go head to head and talk about our current camera choice. Is upgrading from an A7r iii to an A7r iv worth the extra $$$? We talk about the new features the a7r4 has to offer and the pros and cons of both bodies. I get nerdy and pull out the numbers and testing to show Tony his choice might be wrong.
Both cameras are great, but newer, bigger, and more expensive might not always be the right answer for you!