Believe. 
But this is at 1.2 isnt it? It can be good there but when stopping down the focus moves. (you can see this in the photozone tests where he focusses on the milimeter-chart and stops down. Focus moves away and at some point its even possible that the point that was sharp at wide open isnt in the DOF when stopped down)
And thats i guess why so many 1.4 (and even 1.2) canons are a bit "soft" (not 100% in focus) at 1.4. Cause they have to make a compromise for focus accuracy stopped down and wiede open. If wide open hits it 100% even in close distance, stopping down will go bad.
I once made the mistake of making a microadjust for near conditions on my 1.4 canon wide open and then taking (important) Pictures of people 2m away stopped down to f4... Focus started most times somewhere a little bit behind the ears...
I sold that microadjustment camera cause it makes me crazy trying to get the perfect result and there are so many things to keep in mind for not making it perfectly wrong