Actually, Rafael, you'd be surprised. furfly has never had to
compete against Zope; in fact, as far as I know we've never
competed against another technology, only other ACS shops.
But Musea has lost jobs to Zope, and I doubt they're the only
ones.
We're talking to a potential client right now who evaluated both
Zope and OpenACS, chose the latter, and then went in search of
programmers. How many make the other choice and we never
know about it?