Here's an article from Grantland: http://grantland.com/features/the-30-week-8-phillies-royals-blue-jays-giants-cluster-luck/
Looking at how lucky teams have been with clustering hits on offense and scattering hits while pitching.
So it seems the Jays have been one of the "luckiest", but entirely on the pitching side, with the hitters actually have room to improve.