I'm gonna jump in here.
Well intel is the performance king and amd is the budget bang for buck performance king,
4k gaming is another story your better off with a 2700x over a 9900k when playing at that res and use the saved money on a better graphics card so that is a nice alternative there.
So at stock clocks with the 2 processors used to the fullest amd is the value for performance king and the 9900k is the performance king.
But however if you overclock it which is the 2 processors changes all of that to be frank.
As far as i know a 8700k at 5ghz overclock scores the same as the 2700 x at stock clock on cinebench, so yeah with games using 6 cores the 8700k certainly is far ahead over the 2700x.
I think as time goes on and people in this thread know ryzen is a nice alternative etc, etc, etc over the intel processors or the 9900k.
my 2 p.
if you disagree with me then please correct me so i stand corrected, i must admit i am not that well informed but after spending a lot of time researching so yeah.
Dan.