What is wrong with this Minolta lens?

At first it looks overexposed. But then, both shots are 1/80s and F3.5 vs F4.5, so the Minolta should get even less light. Even if the blades are sticky, it would be 1/80s and F3.5 just as the Sony lens.

For me this looks like a contrast problem. Check the lens for fungus or other problems on a lens element. Is there an old filter on the lens? Try with hood.