Whats your point with that chart? that all CPU's are within 20% of each-other?
Well at least we know why you think anything above dual core CPU's are unnecessary E-Peen.
CPU's like the G4560 are very popular because of chart's like that, people think (this obviously includes you BTW) they are getting near 7700K performance for £65 but the truth of the matter is if you don't actually put any workload on the CPU's they can all look like pretty much the same performance, if anything at all this is what this chart represents.
The reality is the G4560's performance will have frame rate fluctuations from high to low at the extreme with games that demand anything more from them than CS-GO does.
For example, when reviewing CPU gaming performance by doing anything more than just looking at a wall 8 feet infront of you the G4560 and even the 4 real core i5 are quickly and substantially find them selves out of their depth, they end up with a massive performance delta loss to the i7's and Ryzen 5' / 7's..
https://youtu.be/4RMbYe4X2LI?t=5m12s