You have to be careful when comparing latencies as the numbers can be completely meaningless depending on workload.
Also, note that the numbers have changed significantly for Zen since its original launch due to updates from AMD/Manufacturers, so many of the numbers you see in older reviews are no longer accurate.
If you read reviews of the new Intel processor today, you'll see latency numbers have increased for Intel with their new architecture:
https://www.techpowerup.com/img/17-03-06/7ca3a1705392.jpg