at f/8 or f/11 where he was shooting, it is quite possible.
How about at 2.8? 


EDIT: Sorry, didn't mean to sound like a dick. But your argument about shooting at f/8 or f/11 can be used for pretty much every lens in existence. They're all sharp at f/8 but that's not the point. It's the other apertures that show the quality of the individual lens.







