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From the same review, stock 8700K with 2666Mhz DDR4 compared to a 4Ghz 1700 with 3200Mhz DDR4:
25% faster in Crysis 3
39% faster in Far Cry Primal
https://youtu.be/CZIVaGcax70?t=616
Ryzen wouldn't be much of an upgrade over a 4770K/4790K.
it seems the i7-8700k is great at 1080p that's if people who buy £400 CPUs still game at 1080p