Originally posted by MorgothV8 I was thinking of TMax 400 too, but never used it.
I was dissapointed with Ilford 3200, really happy with TMax 100.
Also used Velvia 50 & 100 but on Fuji GSW 690 III (my second MF).
Fuji was superb on Velvia, P67 - don't know yet.
Velvia is superb properly exposed
I wouldn't say that you don't know about the P67, the camera isn't going to change the film characteristics.
---------- Post added 07-13-2015 at 11:47 AM ----------
Your absolutely right that the technical spec of the film is 1000 ISO. I jumped to the conclusion that you thought the film could be purchased in more than one ISO. Yes film with a EI of say 3200 can technically be between 800 and 1250 depending on the brand. These films are designed to yield good results when being pushed to high ISOs, which is why I would purchase them. And why the advertise the high exposure on the box.
If you need to shoot at 1600 or 3200 maybe you should try Neopan 1600 and expose according at the desired ISO. It may yield more pleasing results for you at those speeds if you are not a fan of the Ilford. I also recommend Tri X over Tmax in regards to grain.
Regarding the larger negative: Your grain will still be the same on the larger film size. But yes a print made from 35mm film would be enlarged more than 120 film to print at the same size so the grain would be probably more noticeable in a same size print from the smaller negative, especially in a larger print.
Just curious are you developing yourself, enlarger printing or film scanning? These will also have some impact on the results.