We'll from trusted retailers the i5 is currently £147 (has been under 150 for months), while £167 is the best for the Ryzen.
If using max overclocked figures to compare, it would make sense to show results for the i3-8350k overclocked (also aorund £150).
I imagine the 8350k OC would thrash Ryzen in most MMORPGs, especially the badly optomized(most) ones. In other games I suspect it would also perform well enough to make no real world difference.
The 8350K is a 4 core 4 thread, i just upgraded from a 4.5Ghz Haswell and its way slower in games than the 1600 let alone the 2600, so no.