Regardless of how it shapes up to the Core i5-9600K, the Core i7-8700 is definitely a much better gaming CPU than either of AMD's Ryzen 7 2700 / 2700X chips.
Number of Cores 6
Number of Threads 12
Base Clock Speed 3.2 GHz
Maximum Boost Speed 4.6 GHz
L3 Cache 12 MB