Here is a good thread featuring two battles of mine over the past week. I think that they illustrate how important it is to play our Knights the CORRECT way against a strong tournement viable list.
I go up against a Daemonzilla army twice in the thread...secondguessing myself the first time, getting stomped, then going back to my regular plan with my "take all comers" Grey Knight list....with a much better result.
....and all without having to resort to Sanctuary. (waste of points in a tournement situation if you ask me)
http://www.bolterandchainsword.com/index.php?showtopic=154789&st=0