Please take this survey on venture firms and their correlations. So far with n=203 Andreessen Horowitz is the top firm followed by Sequoia, USV, Kleiner, Khosla and Accel.
https://www.surveymonkey.com/s/hackernews
I'll post the results in the comments below in about 2 weeks.
https://www.surveymonkey.com/s/hackernews