So, finally bought new 15" MBP after much deliberation. Judging by geekbench scores expected 40% improvement versus my old machine. Just run an exhaustive test running same statistical model on old machine (2011 15" MBP) versus new one. Very disappointed that the real life speed test was only about 12% quicker. Thinking to return. Main reason for expensive new machine was more speed and I didn't get the speed boost I expected. Opinions ?