Let's say you can't decide which CPU to buy, you can make a decision by looking at the Intel Core i5-6600K Cinebench r20 score multi and single core test and decide how powerful is this processor, is it a good CPU or a bad one to buy. Here you can find useful information from Cinebench r20 benchmark. A careful analysis of all the specifications, so that it can be easier to read, is made by the table. After reading the results this test and video, you already be able to understand do you need to buy Intel Core i5-6600K or not.
All the number that you have looked at here do not mean that taking them into account you should undividedly trust a simple quantitative comparison. Better to watch benchmarks video and read the opinion of of people who bought Intel Core i5-6600K before deciding buy this processor or not.