What is the sharpest lens you own?

I know this is a Canon forum, but my Fujifilm XE-1 with 35 mm f1.4 camera just arrived. Based on some quick tests, that sucker is sharp wide open at f1.4, gets a bit sharper at f2 and remains tack sharp until diffraction sets in.

Back to Canon. I think my sharpest Canon lens is the 400 mm f5.6 L. Images seem to jump off the page whether the lens is wide open or stopped down.

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Jim
http://www.pbase.com/jcassatt