Shooting products, food, architecture and people for over 25 years.
Apparently Sigma lenses have a wide variety of quality within the same lens specification. I know one photographer who had one of their 18mm lenses, and he said it was the sharpest lens he owned! But then he tried a different one that belonged to a friend and it was terrible. So his resolution wsaa to only buy a lens he could test. He'd take his camera into the store and shoot with different lenses until he found a good one. Then he'd buy that one. Good luck!