I have pushed Portra 400 to 3200 with excellent results, best fast color film ever produced, I would say its even better at 1600+ then 400 ( a bit more color punch)

I havent any scanned (that I can put online) but a bit google gives:

Big review (get a coffee but its worth it) http://figitalrevolution.com/2010/12...ra-400-review/

@3200: http://www.camerasandfilm.com/archives/418
@1600: http://www.camerasandfilm.com/archives/409

and on flicker: http://www.flickr.com/photos/phloodp...7626086079045/

love the new Portra, i would say its the best color negative film ever produced
(and its even exist in 8x10)
cheers