Sigma 50/1.4 EX DG HSM vs Sigma 50/1.4 Art
https://blog.sigmaphoto.com/2014/sigma-art-50-vs-50-ex/
經測試後驚人地發現有不少項目前者竟比後者更優勝.............包括..........(羸到Art,Canon 50/1.4行埋一边)
Sigma 50mm/1.4 I vs Sigma 50/1.4 II Art
https://www.thephoblographer.com/2014/04/13/one-sigma-50mm-f1-4-vs-sigma-50mm-f1-4-ii-art/
又一个鬼佬話 50/1.4 EX DG HSM 冇乜嘢輸俾 Art
Conclusions:Both lenses offer great image quality overall and they both won’t disappoint you at all. If you’re an owner of the older 50mm f1.4, we’re not totally convinced that it worth the upgrade ...............