Mac OS X Mountain Lion--What Sophos does that "Gatekeeper" and other security built-ins do not?

With this week's Mountain Lion announcement, Apple is trumpeting Gatekeeper, sandboxing, and runtime protections as a built-in set of seamless threat protections.

This does not appear to address the braod spectrum of threats that Sophos Enpoint Protection proides to MAc users.

Is there a definative and clear statement from Sophos on why their products provide superior protection and why the built-in security features of OS X Mountain Lion will not be sufficient for true protection?

Thanks.