Intentionally or not, Rob-F has raised a good point. That is, what's the intended use case? Here's what he said last year on photo.net and I think it makes a lot of sense (amazing how easy it is to find these things via a simple Google search - hope you don't mind that I quoted you Rob):
"Really, it depends on your purpose. I use the F-6, or the 803, or the F5XB, depending on what I'm doing. The F6 is a 'working' bag more so than a compact storage bag. I can drop an M6 with a large lens into the main compartment, another M6 with a small lens into one of the four padded cells, and several other lenses into the three remaining cells. The compartments are large enough so as not to be fiddly. You don't have to waste time carefully slipping lenses and cameras into place. You just drop them in.
For a compact bag to take into a museum, restaurant, etc. or on a hike or onto an airplane, the 803 or F5XB are better."
So, in addition to the basic question of "will everything fit?" there's also the question of how and where you intend to use the bag.
Hope this helps.
-Randy