So I decided to try to guage the iso of the EX1 at 1080/60i on standard gamma.
The result was astonishing. The video speaks for itself.
(before anyone goes off the deep end, yes I know this was not done with an 18% gray card, and the result is not scientific or perhaps even "correct" in the true sense. But, for this test, on this subject, on this day, rating the camera at ISO 3200 gave me a proper exposure.)