Stefan,
I'm interested in the result. In my experience, it seems Spyderco Reailience has better edge retention than the Navy (k631). I guess the Navy is not a true 440C, but either 8Cr or 9Cr.
Have not tested the Enlans I have against Resilience. Might not be easy, due to different blade grind/profile & thickness, that make the Enlans having more resistance going through cardboard.
Tried to use a SAK to do the same, and found it easier than even the Resilience, although the edge doesn't last as long. Thus must be due to thinner blade and lower (flat) grind angle than Resilience.