Thanks all
The noise isn't too bad for 1600ISO, but it's still something I'm trying to get to know on this camera. The noise characteristics between my Nikons and this Canon are very different, so time will help here I guess. The night (Friday) was pretty cold, and ice was forming on the camera pretty early on.
Mike - I took quite a few subs, but wanted to see how a single frame would emerge on its own. I'll try and process a few tomorrow.