I have been hearing rave reviews about the Sigma 50mm 1.4 ART lens and decided to make the leap from the Canon 50mm 1.4 to Sigma. Was the jump and investment worth it? Absolutely! It’s been about 72 hours since I’ve had this lens and can say that I noticed the quick AF system on the lens and the sharpness on it. I can honestly say, this is one of the sharpest lens I have ever shot with and was able to crop in at 200% on an image with Zelda and it was pin point accurate. Speaking of Zelda, she had no idea what she was getting snapped with but the lens got her every move. Sigma, cheers to you!