The tv show Human Weapon had a good episode on Krav Maga. Near the start of the show a guy with a rubber knife attacks the big MMA guy: the latter would have been filleted. By the end of the show/training he at least stood a chance (and we are not talking about the use of trained, knife fighting techniques).
The best knife fighting movie I ever saw was called "Exposure". A photographer in Rio gets trained in "La Grande Arte" by a master to take revenge. Great training and fight scenes.