Extrapolating from the bench and based on my experience with a 9900k overclocked to 5Ghz as even at 4k, whenever I sprint within a heavily populated area or drive through it, the game just crushes any current gen CPU even at 4k, where you will see drops in GPU usage and FPS goes below 60 on pretty much any CPU out there. On the 5950x, the game just refuses to use any more than 8 cores, so only those will be maxed out while the rest remain idle and FPS continues to drop below 60.
You can see this from 11:06 onwards in the below video. The 10900k gets brutalized as he sprints. This was the single area the reviewers should have tested as no open-world game I have apart from Far Cry 6 actually shows CPU bottlenecks at 4k.