Looking at the internal measurements it looks like your gripped camera will fit and the video demo shows a gripped camera in use with the bag. Yet, in the reviews, a Nikon D3s would not fit so they got the 15L instead.
I ordered and received a 10L for my 7D with grip. It fit but was tight so I returned it in favor of the 15L. I am very happy with the 15, I generally carry my gripped 7D, 20-200mm, 85mm and a 50mm and I still have room to spare.