I guess my point was a knife like any tool for use is only good at the specific tasks it was made for... You don't use a 10lb hammer to fix a watch. Ceramic knives were first introduced from the Japanese as sushi and fine culinary uses; as for a field knife that I would risk my life on not so much. Being in the field I believe anyone would be better suited with a high strength and quality steel blade that would pass the 90 degree test.
Also from the little research I have done cutting with a ceramic blade anything demanding will put nicks and grooves in the blade and it will need sharpening almost every time out of use. Not very useful say on an ftx or deployment when keeping your blade sharp is the last thing on your mind.
The only plus is if your on a super secret squirrel op you can pass through metal detectors from some governmental regulated knives, you must purchase a document that I believe is similar to a silencer stamp. Another plus would be it is a non metallic so it would not make sparks or be susceptible to some types of acids. To be honest I haven't really looked into getting an all ceramic knife that much. Now most of the ceramic chef knifes and the like have enough metallic content to make a metal detector go off so don't buy one and try to get on the next red eye.
I will say it again they do make FINE sushi knives if your into sashimi and the like.
http://www.youtube.com/watch?v=JFnT5...om=PL&index=41