The 28 1.8 flirts with unusable softness wide open, and even then is only 1.3 stops faster than a 2.8 zoom. Those considering 28 1.8 as a "standard" prime on crop camera would be better served by the Sigma 30 1.4, unless they plan on moving to FF soon or use both FF and APS-C bodies. However, the 28 1.8 is cheap, compact, and has fast & accurate AF. The 28 1.8 is for FF street photographers who want a small & light wide angle, FF low light whores on a budget (such as myself), or APS-C users afraid of Sigma quality control. For any other application there is a better or more cost effective option. I'm saving up for a 24 1.4 II as I write this.