Yes. Wawrinka at the end of the day has proven to be as good as Murray at winning the slams. Haas hasn't proven as good as Roddick.
Wawrinka has never beaten a fit Andy Murray in a slam though. Like ever.
2010 US Open - Murray, still a bit of a novice too, but had the trainer out twice during the match. We can, at best, list this one as debatable.
2013 US Open - Murray had surgery on his back more or less right after that.
2017 RG - Murray might not even play to a high level again he was in such bad condition.
Genuinely just don't see Wawrinka beating a fit, form Murray at a slam, as evidenced by the occasions it has happened.