Ok I did a quick-and-dirty capture of EPIX's VOD presentation this morning and here are the results.

The good is that the Imax scenes are 16:9, I took some screen caps. The aren't the exact frames (I have a baby in one arm and a computer in the other, so accuracy is lacking)

Blu-ray (Top)/VOD (Bottom)

Blu-ray (Top)/Elegant Tobacco's Image\VOD (Bottom)

The 2.35 scenes seem to be cropped at the sides and not open matte.

The bad news is that the presentation is watermarked/bugged but luckily not continuously throughout. The EPIX logo comes and goes:

And sadly, even worse, there is a lot of macro-blocking/bad mpg-2 compression:

I made a 14GB MKV (1080i/ac3) of the capture.