By Ka-bar, do you mean the brand? Or do you mean k-bar, as in the common and misapplied knickname for the MkII combat/utility knife that was issued to all branches of the US military during WWII and the to this day by certain units of the Marine Corps?
If the later, MkIIs vary widely on who made them, just like any pattern.
If you mean Ka-bar the brand, I have, do, and will continue to trust my life, safety and comfort to one of thier MkIIs when I'm off the pavement and sometimes on it. It takes a shaving edge, holds it well. It's no trickier to maintain than any other quality carbon steel blade, and while I'd never be so stupid as to baton with it or try to fillete a rock or a car the way some "testers" would, it will take a lot of abuse. Why do you think the Marines have used it for 60 years?
I can't comment on most of thier imported folders or some of their newer fixed blades, but the Mule is impressive and sometimes gets carried when I can't carry it's big brother.
Keep in mind I have spydercos, benchmades, sogs, bucks and gerbers in my drawers at home. And I'm someone who uses a knife pretty much every day for one thing or another. The only other knives I bother to carry are my Leatherman, sometimes a SAK, and a cheapie folding kerambit for cutting cardboard and strapping.