Is it just me or is this a bit pointless?
There are 100s or maybe even 1000s of factors that could make this an unfair comparison.
Handshake, wind, post processing, too slow shutter speed, different bodies, different apertures, back focus issues, etc.
I dont think this is really something you can determine given these 2 specific images, and how they are both of fairly good quality.
Also I would like to point out that certain non-L lenses are extreemly sharp.
Just ask Overread to see some photos from the 65mm MP-E if you dont believe me.
Sorry if I am killing the fun here