Sorry, didn't mean to offend ... but I thought that the edge performance of the old Sigma 30 1.4 was the main complaint about the lens. (See review at photozone as an example.) That said, in the majority of pictures above the edge performance is irrelevant, and the results are excellent.
From the MTF charts published by Sigma and early test data from lenstip, edge performance of the new 30mm 1.4 Art is improved - not as good as the full frame 35mm 1.4, but improved. But if you are creating photos like the CK bottle or portraits above you may never be able to tell the difference.
I wasn't offended, no apology necessary. Your not wrong about the previous version. Its not as good as the new version based on early test results. To those not familiar with the EX version your comment might have made that lens sound much worse than it is. To be sure, it is soft on the edges, especially wide open. A bigger issue however is the inconsistent AF. I purchased a new focus screen for manual focusing specifically as a result of that issue. When this lens is in focus, the results are quite good.