I thought Portra 400 was supposed to be based on Vision 3? That's what this guy reckons anyway:

http://www.onlandscape.co.uk/2011/05...rtra-400-film/

I also read it here:

http://www.twinlenslife.com/2010/12/...portra400.html

Although their results seem to show different results from the two. I do agree with you though, Kodak is an icon, and they could probably market that a lot better.