AMD launched their third generation of mainstream Ryzen processors today, but we were only provided with the low-end Ryzen 5 3600 ahead of time. We have ordered the Ryzen 7 3800X and Ryzen 9 3900X, and should be testing them soon, but until then we can at least look at how the overall architecture is doing with the example we do have.
After Effects CC 2018 CPU Comparison: Intel 8th Gen vs X-series vs Ryzen vs Threadripper
After Effects is a tricky application when it comes to choosing a CPU as there are many factors that come into play. Not only is there raw rendering performance, but the new integration with Cinema4D and even the amount of system RAM you need all play a role in determining what CPU is the ideal choice for your workflow.