Wccftech published Intel Core i9-9900K 8 Core and 16 Thread 5.0 GHz CPU Review Ft. Z390 AORUS Master Motherboard A quote from the article:

Intel has come a long way with their mainstream processor platform. The platform has largely seen stagnation in terms of core and thread count over many generations since the first Core series CPU that launched back in 2010 but last year brought a big change to the CPU giant. What seemed to be a generational core clock bump has now turned into a generational core count bump while keeping the clock speed improvements.

The Coffee Lake-S 8th Generation family, was the first big core count jump on the mainstream 300 series platform. It was an opportunity for Intel to show that they don’t only hold the IPC or clock speed advantage on the mainstream segment but they can also offer good multi-threading CPU performance. While the jump to 6 cores and 12 threads was great, the competition was offering up to 8 cores and 16 threads on their mainstream platform.

 Intel Core i9-9900K 8 Core and 16 Thread 5.0 GHz CPU Review Ft. Z390 AORUS Master Motherboard