As a daily Zotero user, not really. The nicest thing I can say about it is, it has plugins and is FOSS. Maybe the new 7.0 release will blow me away, but I've been waiting for it to get out of beta forever.
More fundamentally, we need to stop disseminating scholarly work as PDFs, a format primarily designed for print. Plain HTML would be an improvement. Even better than HTML would be an extended variant with scholarly-specific semantic markup and universal, animated, explorable figures. Embedded notebooks would be cool, too, but disseminating data would still be a major challenge. (And I don't just mean storage/transfer; a lot of researchers are reluctant to share source data to the world.)
More fundamentally, we need to stop disseminating scholarly work as PDFs, a format primarily designed for print. Plain HTML would be an improvement. Even better than HTML would be an extended variant with scholarly-specific semantic markup and universal, animated, explorable figures. Embedded notebooks would be cool, too, but disseminating data would still be a major challenge. (And I don't just mean storage/transfer; a lot of researchers are reluctant to share source data to the world.)