I changed Sigma 85 / 1.4 HSM ART to this lens, I do not regret anything. If that lens simply did not want to get out of the bag because of its weight and size, then this lens wants to shoot and shoot. Compared to the previous version of Sigma, the lens has a much faster AF speed (about 2-3 times), which allows you to calmly shoot sports events, smaller XA, a much more convenient lens hood (I don’t understand why no one thought of this before), a higher real aperture ( about a third of a stop), holds light better, more functionality. Definitely worth the overpayment of 20-30k relative to the HSM version. Definitely will be my favorite lens for the next ten years. My comparison of this version and HSM version: https://www. Youtube. Com/watch?v=ma8lru4FRDc