dpreview has just completed the full review of recently released Sony a7R IV (B&H Photo Video/Adorama/Amazon) full frame mirrorless camera today. It received their gold award and 91% overall score. Currently the best camera reviewed by dpreview.
The new announced Sony a7R IV now shipping today, currently out of stock everywhere, you can check pre-order options at B&H Photo Video/Adorama/Amazon. dpreview has already add a7R IV to their studio comparison tool, so you can compare the new a7R IV with other related cameras.
The Sony a7R IV is the latest full frame mirrorless camera from Sony, it has a ground breaking 61MP full frame sensor. Here is a quick specs comparison for Sony a7R IV with a7R III with Nikon Z7 with Panasonic Lumix S1R. You can take a look at full specs comparison here.