You may have difficulties with the choice of a processor, you will solve them by looking at full benchmark Intel Core i7-5820K Cinebench r23 score multi and single core and decide how powerful is this processor, is it a good processor or a bad one to buy. Here you can find all information from Cinebench r23 benchmark. A thorough review of all the specifications, so that it can be easier to read, is made by the table. After looking at the data this test and video, you can already make an informed decision about do you need to buy Intel Core i7-5820K or not.
All the number in the article above do not mean that taking them into account you should entirely trust a simple quantitative comparison. Be sure to watch the testing video and read the reviews of real owners of Intel Core i7-5820K before making a choice buy this CPU or not.