Is there any evidence that Google is actually better at software engineering than other companies? IMHO, it seems they have enough money to deliberately do things inefficiently which would kill a smaller company, but Google can manage to succeed through brute force. Honestly I think the better example would be from a tiny company that can't afford to do things wrong.
If building, running and evolving very large and complex systems over many years is not a measure of software engineering quality, I don't know how else to compare companies.
I wouldn't call them "evolving" anything software as of late. Their hard science departments seem good though, but these aren't software engineering