^
I have taken plenty of sharp photos with the 12-24, Im sure in that photo it just wasnt focused correctly or something. But, most of my photos with the 12-24, no matter what, seemed to be a little blurry on the right side of the image.
You can see that its sharp on the left side of the image, but the right side is completely blurry which makes no sense. But whatever, I have the news lens and dont have that problem anymore. Maybe my 12-24 has an internal piece of glass that somehow got out of alignment.
You can also see that in these photos, the left side is sharp, while the right, not so much.
But in some photos the right side is completely sharp, like these photos, taken the same day as the ones above.