Oh you can put a lensbaby on anything now!
What are you getting from 800z? When shootign it at box speed and developing for 800, this is what I get. If I want more primary colours / saturation then I rate it at 800 and dev for 1600, or if I need the speed, I rate it at 1600 and dev for 3200. The latter works quite well too, here is an example in really difficult mixed lighting.
Far as I am concerned 800z is the bomb! In medium format, at least.