Canon's new lens MTF charts...

You can find them at their source on each lenses individual page (i.e.)

I do not claim to be the creator of the content; but I did compile them onto a single page for easier reference.

Take a look, I'll let you draw your own conclusions from the charts.
I am wanting the 400/2.8L IS II more and more each time I look at them.

p.s. B&H now has the 400/2.8L IS II on their site at a price of $10,500.

EOS 5D Mark II's price just dropped $200

The Landscape camera whose price and image quality I have long loved just got an even better price. If you have been dragging your feet on the 5DII you may want to give it another look.