You may have difficulties with the choice of a processor, you will solve them by seeing the detailed test Intel Core i7-5820K Cinebench r15 score single and multi core and decide how powerful is this processor, is it a good processor or a bad one to buy. Here is useful information from Cinebench r15 benchmark. A careful review of all the technical characteristics, to make it easier to understand, is made by the table. After looking at the data of parallel test and video, you already be able to understand do you need to buy Intel Core i7-5820K or not.
All the data that you have looked at here do not mean that you should be guided entirely by them and trust a simple comparison of these figures. Better to watch the testing video and read the reviews of of people who bought Intel Core i7-5820K before deciding buy this CPU or not.