No need to intuit - depending on your exact starting and end points, between March 2005 and August 2015, BRK returned 63.4% and the S&P about 92% (and about 10% better if you count dividends, which you should).
^ Yeah. I bought a share yesterday. As I posted, I am happy to let Buffett, Combs and Wechsler figure out how to put cash to work when there are major market dislocations. Even with the size they have to deal with, they are much better at it than am I. I didn't get it at the daily low, I don't think, but it was a few thousand dollars off from where it is now.