The 8600K and the 8700K are right now the hands down fastest gaming CPU's at an affordable'ish price with the 9700K and 9900K being the outright fastest at any money (way too much money!!!).
Yes the 2700, 2700X Ryzen's are absolutely great CPU's and bring a lot to the table, and if productivity is a factor then especially at a price point they are hard to beat but if you want the fastest gaming CPU's, then Intel with there 8600K, 8700K, 9700K and 9900K just cannot be beaten, in fact even the 8400 holds its own against the 2700 and mixes it with the 2700X.
Even the latest games to come like Fallout 76 which has just released the recommended specs to play the game only requires a i7-4790 and a Ryzen 5 1500X...Minimum specs are even lower...So I do not see how the 2700X even with 8 core and 16 threads will beat an 8600K let alone 8700K in the near future for gaming, especially as it cannot do it now with games that can utilise more than 6 cores like Battlefield 1, PUBG and others....
Now if we are talking best bang for your buck, then absolutely the Ryzens are by far the better buy...