You can tell a lot from DI's - afterall, it's the raw sound of the instrument which is important.
Just checked them out, dry, and through my rhythm plugins. Pretty shocked how different strings can sound, actually! I thought the D'addarios sounded best by far - the Markleys and Elixirs were pretty similar but much edgier and less bass. The Cobalts had the least bass of all and just sounded weak to me.
However, it is of course just one test.