I have not heard the Stradivari's , but was at a dealer the other day and he had the Carbon 5A's playing. Although not fully broke in, I was really impressed with what they were doing. He has the 7's set up in his main room with D'Agostino front end and I have heard these many times. As much as I love what the 7's do, I felt the 5"'s we're performing on the heels of the 7's. The 5's were in an ARC front end using an LS27, and sorry I don't recall which mono locks. But I really thought, if I could, I would be hard pressed to spend the extra for the 7's based on what the 5's (not yet fully broke in) we're bringing to my ears. I guess in short, the 5's present a tremendous value in the price range and nip at the heels of speakers costing 20-25K more.
Just my opinion of course.
Just my opinion of course.