I have 2 la griffe pikals (actually one is nominally my GF's to carry around - works great with a spyderco G clip and can be carried w/ no belt - and one is for my mom's Bday gift) and can attest that they do take a very, very sharp edge. I think functionally speaking, for the purpose of a pikal style knife, the limiting factor in causing damage would not be sharpness with the ti knife. What I mean is that with a "working" knife that requires extreme finesse in fine cuts, I would probably favor steel (having also handled Ban's 3v knife and seeing what it can do), but that's really a nitpicky point. With a defensive knife where near-maximal force is used, and there is very little finesse in that sense, ti or steel will both work great.
What I'm trying to say, perhaps unsuccessfully, is that there is a curve of force applied vs sharpness necessary for a given outcome. At one end of the spectrum we could have surgical tools where we want finesse = less force applied for a clean cut. At the other end of the spectrum we could have a convex ax used to split wood where max force is applied and sharpness is less important. The sharpness becomes less of an issue as more force is applied (not arguing it's a non-issue, but with Ban's knives, you are getting, subjectively, about 15% more top-end sharpness from the steel knives)
A friend of mine keeps a Ti Lagriffe Pikal in his gym shorts while working out.