The 17-55 on a 7D is sharper than the 24-70 on the 5D MKII

In a couple of threads I was told that the 17-55 is only sharper than the 24-70 because the 24-70 is made for a full frame and with an APS-C sensor you cannot see it's full potential bla bla bla.

Well, I had the the 7D+17-55 and the 5DMKII+24-70 and took a couple of shots, wide open (2.8) ISO200 and got this result. I took 3 shots with the 5D to see if it could get better, but it didn't.

This is the image (this is the one taken with the 5D by the way) I took with both lenses.

This is the crop

7D

5DMKII

Not only the 17-55 is sharper, it also has less CA.