The lens works great on the Sony A7. I simply adore how it renders the pictures. Amazing for a lens that's more than half a century old and without coating on the glass. The pictures look smooth as silk and none of the harshness of most modern lenses. The bokeh is simply delicious and pleasing.
If you find one cheap, take it and you won't regret it.
All pictures below were shot using the Sony A7 and A.M 5 Inch f4: