Ti knives, and especially swords, are my first choice since many moons. I have one or two, all forged by some talented guy.
To be honest, the tungsten carbide treatment - i have carbidized a bunch of untreated 6al4ti knives myself - is doing ok, but it is really no match for a properly treated Ti alloy that is suitable for bladewares (which could be still carbidized).
For best results on a carbidized Ti knife, you have to put an edge on the non carbidized edge only and sharpen only that one side, which is by default not very sharp to start with and you also end up with a micro chisel edge. Sure, it "should" kinda sharpen itself with use but still, it's a workaround backup knife for me only. That is something you should consider, and this is all my personal experience only.