I realized that somewhere in the process of acquiring the tone of modern English I had lost my identity. It was painful to realize that in my language I was smart, but I sounded stupid in English. Example: while walking with my Canadian friend one day by a church, he started talking about the architecture of that particular building, and while I wanted to say a few things about how I liked the Gothic details on the arch at the entrance, and how I admired the intelligent choice of stones, all I could squeeze out was, “Yeah, it’s cool”.-- from the CBC radio broadcast "In My Language I am Smart" by Dragan Todorovic.
Acquired meaning is superficial. Sound puts word into context, but the deeper shades of expression are not learned. I responded the way that Clint Eastwood, or some other action hero, would in one of their roles. Back in Serbian language I was connoisseur of arts; in my newly acquired language I was a cop.
I think this pretty much sums up my answer to the question "how fluent are you after years and years of studying your favorite foreign language?"