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| p.1 #9 · Canon 28mm f/1.8 vs Sigma 30mm f/1.4 (A) on Full Frame |
I owned the original Sigma 30mm 1.4 and that vignetted hard on my 5D, so the 28 1.8 was a no brainer when I was shooting both APS-C and FF. Personally, and as reviewed, the original 30mm 1.4 was typically had similar performance (a tad worse, but at 1.4 vs 1.8, so....) to the 28 1.8.
Also, the used prices of the 28 1.8 are quite low, ~$350, where as there are none of the SA30 1.4.
Sigma said the new A30 1.4 is all new. The original was 7/7, the Art is 9/8 (elements/groups). A quick read at LensRentals.com (http://www.lensrentals.com/blog/2013/04/sigma-30mm-f1-4-dc-hsm-vs-sigma-30mm-f1-4-ex-dc) shows the new one performs better in the corners, but thats about it.
Finally, have you tried the 28 1.8 on the 40D? I've always found overall that Canon lenses focused better on Canon bodies than Sigma lenses. I'm quite surprised about such a high MA adjustment. But until you shoot it on the 40D, you can't say it wont work well on it.