Is there an adapter that allows for the 5Dmii to mount Nikon glass? If so, has anyone used it? I have plenty of FF Nikon lenses but I'm not about to go all Canon for just video...not yet anyways. I'd love to get a 5Dmii if it worked well with Nikon glass.

Absolutely, yes. Many of us are using $10 Nikon - EF adapters from Ebay. Do a search in this section and you'll find loads of material.

I did a search and found little when it came to g glass.

Nikon G - Canon EOS Adapter (http://www.16-9.net/nikon_g/)

The glass I have is G. No aperture ring. Would this adapter do? Or would I be better off buying EOS lenses with a Markii?

Still couldn't quite understand if there was any loss of quality using Nikon G glass with the Mark2 or not and there is nothing on the V2 Adaptor

Ah you didn't mention G glass in your original post.

Ewww.... G glass...

j/k :)

For $300ish, it would have to be one heck of a nice lens for me to spend that much on the adapter. If it is your only lens and this is a full time switch to Canon, I'd sell it and start collecting EF lenses... or old Nikkors.

I have one G adapter. But only because the Nikon 14-24G is the only great superwide zoom.