I don't think that shoe has dropped yet. As far as domestic surveillance goes, NSA seems to be approaching the level in terms of capabilities of Chinese MSS. In terms of foreign surveillance, although we can safely assume NSA has access to more fiber and hence internet traffic, there seems little reason to think their hacking activities are any more prevalent than any other large intelligence agency. Those capabilities are, after all, rather cheap.

What we haven't learned of, at least yet, is rampant industrial espionage by NSA to steal R&D and a pipeline for dealing with the stolen results. China, at least according to US allegations, has precisely that.