As mentioned in a previous post, i'm currently running a relatively longer tournament between different Stockfish 7 builds in order to find out, if there's such difference, which build is better.
I must admit i won't be surprised if thousands of games reveal nothing precise. Maybe there's nothing to find.
After 1000 games played, there's no clear sign of superiority between 3 builds of Stockfish 7. Even the gap between Komodo 9.3 and Stockfish 6 doesn't tell too much.
That needs more and more games. Therefore, there will be more and more games!
1) Stockfish 7 JA 230.0 / 400
2) Stockfish 7 DF1.60 220.0 / 400
3) Stockfish 7b2 JA 218.5 / 400
4) Stockfish 6 170.5 / 400
5) Komodo 9.3 161.0 / 400