Hello afsmithphoto,
I use shoot tons of P1600, at anywhere from ISO 800 to ISO 6400. I have since replaced this film with heavily pushed Kodak Ektachrome E200, which is substantially less grain. I tend to agree with Helen B on this one, in that Portra 800 works better.
Ektachrome P1600 is more like older Ektachrome 400X, almost like colour TriX when judging the grain. It has also become quite expensive per roll, which makes me think it might be soon on the cut list from Kodak. The Kodak reps suggested I use Portra 800 pushed one or two stops, and even gave me a few rolls to try out. However, my preference is towards Ektachrome E200.
The Kodak PDF on Ektachrome E200 only lists one and two stop push setting suggestions for E200. I have worked out additional push settings and exposure compensation for up to 4 2/3 stops push. This film does not push in a linear manner, so with each push step more exposure is required. There is also a blue shift, which is good under night shooting conditions and means a weak blue 82A or 82B works better for filtration than a much stronger 80A. I find the results from this are substantially better than anything I got with P1600.
The only remaining advantage of P1600 is being able to shoot at ISO 3200 or ISO 6400. If you require anything below that, either Portra 800 pushed or Ektachrome E200 heavily pushed work better. I have numerous samples at a bands website:
http://www.bigtimeoperator.com then click Gallery. When you look at the night images, the file name indicates the film used. There is a mix of P1600 and E200 shots there. I also have one ISO 3200 shot using P1600 on line at:
Dead Link Removed
At smaller final print sizes the grain is not an issue, at least not for me. However, I think this shot might be better on the latest Portra 800 used at ISO 3200, even though that is quite a push. The main lab I use does not push C-41 films, so it remains a poor choice for my work.
Ciao!
Gordon Moat
A G Studio