I have one constantly pushing 5.1Ghz (disabled speedstep etc. been stable for months). I bought it because there was no comparable AMD cpu and as far as I know AMD is still behind. Why do you think it is not a proper answer?
A current 9900K might be some 20%-30% faster than a current Zen, but it will no longer be so when with the new lineup.
Meanwhile mitigations are eating up Intel's performance advantage..