Hello,
i am wondering if the Z1 is a better Low Light Performer than the ex-1.
The ex has a 2/3 sensor and the Z1 “only” has a 1/3 sensor.
I mean i had the Z1 by myself and the LL Performance is acceptable – good, but i think the Ex-1 goes better at l-l situations.
For your case:
I would go with a pana
AG-AC 160 or the new DVX200
or have a look at the Canon xf 300 / 305
would be better for you spending a couple of bucks and borrow them before you buy.
regards