I 've shot 4 rolls of Wittner F64T last summer, and about 20 carts of
Kodak E64T since it is available.
Here is my opinion :
-> Grain : the Wittner F64T is far less grainy, it looks as "grainless"
as K40 did.
-> Sharpness : Better with F64T.
-> Colors : The F64T looks more "blueish" than the E64T.
May be the built-in filter of the camera is not enough...
To my eyes colors of E64T looks better.
-> DIY Sound striping : easy with F64T , quite impossible with impossible with E64T -> But Wittner is now selling a new cement for E64T and E100D (I will try it next year).
I shot a demo roll of F64T last year from Spectra. I would agree that the grain is tighter and images sharper than Kodak 64T. I used an 85B filter and the colors looked great. The problem with E64T, is that it is not that new of technology... seriously, it's a 64ASA stock with the grain of what you would expect from a modern 160ASA stock.
I shot some of the Fuji 64T -- the same sample stock that T-Scan utilized from Spectra. Unfortunately I didn't shoot it under optimum conditions. I think I screwed up with the exposure as well, can't recall. But you can see what I shot as I posted it here:
T-Scan, do you have your footage online anywhere? The guys from Spectra said it looked great.
Bottom line though, I'd rather shoot the Fuji than the Kodak 64T. I think the grain structure is much finer in the Fuji. I just don't like Kodak's 64T though I know a lot of people here love it.