The 45mm f/1.8 VC is disappointing for me simply because of the size and weight. I need a fast standard prime lens for travel purpose and my Sigma 50 f/1.4 (non-art) is a bit heavy for that. The 50 f/1.8 II I have isn't good wide open. I expected this 45 f/1.8 VC would be around the same weight as the Sony FE 55 f/1.8 , i.e. less than 300g). Somehow this 45 f/1.8 is even heavier than the Sigma with 2/3 stops slower speed. I guess I'll have to get a 50 f/1.8 STM then.