Sigma 24mm f1.8 EX DG Aspherical Macro?

[Lemaildetom]

Seems much more affordable than the newer f/1.4 art model. But i can't find any comparison of the two lenses as it can find 2nd hand..
Any ideas out there?

 

[pingu666]

http://www.dyxum.com/reviews/lenses/Sigma-24mm-F1.8-EX--Aspherical-DG-DF-MACRO_review152.html

 

[Lemaildetom]

Thanks and compare to the new 1.4 art?