Man please!!! it will never be same 56 mm f1.2 and 110 f2. What you will get from result is not a half stop. If you can focus the difference between apsc 23mm f1.4 lens and FF 35 sigma f1.4 lens difference, you will understand it. DOF difference will be huge. Your background will be far away with 110 mm lens. You can't tell only you need 50 megapixel bla bla..