The Vatican and "St Zwingli"

Reading Hermann Sasse's essay, "Sanctorum Communio", I was intrigued by the following comment on Vatican II:

Who can deny that ...a necessary reformation [of the doctrine of the Lord's Supper] often degenerated into an unnecessary revolution? That happened not only in the 16th century, but even in our own age when liturgical knowledge and art have blossomed as never before, as the Second Vatican Council carried out a reform of the Roman Mass, in which no less a man than St Zwingli seems to have served as its godfather.

Can anyone suggest what Dr Sasse meant by this? I'm not sure Zwingli would have been too thrilled by the post-Vatican II eucharistic prayers posted by FDN the other day...

Original posting date: June 2004