I've shot a fair amount of Agfa 100, 200, and 400, mostly sold as store brands, which I take to be equivalent to the Vista line, but I'm not positive of that. I concur with others that the Agfa palette seems to be a bit more muted than Kodak or Fuji products, at least in their "consumer" range. I think Kodak's Portra line is more muted, too. Somehow I've always liked the skies that Agfa film produces. I'm not sure it's really any more accurate a shade than what Fuji or Kodak produces, but I like the look of it.
I've still got about a box of Agfa Signum II color paper in the freezer, so I can still print some of my remaining stock of Agfa film on Agfa paper. I haven't done any side-by-side comparisons of Agfa film on Kodak vs. Fuji paper, so I can't offer any advice on that score.