Thanks jrista, I have been a big fan of this thread and try to post as many images as pos! Keep up the good work!
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Fantastic!! And...is that your 911?
Thanks, no its my dads 911
this one is mine Z4M coupe
BMW Z4Mc Kirkston Pass by TomScottPhoto, on Flickr
Is it just me that thinks the crops look very similar?
Nope, they are very close, distortion is a bit different at 24mm and the real difference are seen at the 100% crops. Even then it's not quite the res you need. See below (hope they help).
https://dl.dropboxusercontent.com/u/12373943/Canon%2024-105%20-%2024mm%20f4.jpg Canon 24-105 f/4 IS (at f/4) 9.8MB
https://dl.dropboxusercontent.com/u/12373943/Sigma%2024-105%20-%2024mm%20f4.jpg Sigma 24-105 f/4 OS (at f/4)