I ran across this at the other forum and it interesting. The test is not very scientific and the force looks to vary a bit from knife to knife but interesting non the less.
This was the post.
Knives that are listed below, ware used in ballistic insert piercing (made of kevlar, can stop 9mm Parabellum and 9 mm makarov) :
Cold Steel SRK
Black Ka-bar
Polish Combat Knife Wz. 98
Walter P99 Tactical
Strider ( i think it's EB-LS)
Buck Strider 880 SP ( had to be tested once more, because it came through out previous hole)
Microtech Hallo III
CRKT M16-04
http://www.youtube.com/watch?v=MXAVUYcZsho