Just as the Nikon 50 f/1.4 AF-S, Sigma is a newly designed lens. It's best is shooting at f/1.4.
However, filter size is 77mm (think how much is a B+W UV 77mm filter), bigger and heavier (505g/17.8 oz) than most 50mm f/1.4. You may have to try a couple due to sample variations (because it is a Sigma).
Still it is a highly recommended 50 f/1.4 lens. You just have to know the pros and cons.
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