Virtual greetings.

This is my first post to this forum.

I'm not a professional photog, but I do appreciate good visual quality. As such, I recently purchased a 5D mkII and 24-70mm f/2.8 L lens.

I took some RAW2 photos using a tripod and timer release of a brick wall wide open at various focal lengths and upon looking at the images, some look rather soft in the corners, but because I have no other similar lens to compare with mine, I don't know if my particular copy is outside of spec or not, and I was hoping that some kind person could have a look at a few of the 100% corner crops who is familiar with what this lens should be like and advise me accordingly.

Thanks in advance for any advice regarding the above.

Ricardo