Not sure it would be an upgrade of any note if at all. I always thought the Legato Link made the top end a bit too soft and rolled off but I was a lot younger then so maybe I would not even notice it now. Plus you like it anyway.
I blind tested streamed cd vs cd in the transport the other day, I was just guessing as to which was which. So local streaming is/can be on a par all else being equal. The streaming services like Tidal, I don't know about that.