Hmmm....
GSO-10 is used most extensively, no competition between it and my other choppers.
The CfV 4.7...
...would be in competition with this modified Ratmandu:
And this knife from Bill Davis...
... would compete with this one from Milan Mozolich
And my fourth remaining blade would probably be a folder...
I complain about aspects of the CalyIII, but it gets used a LOT...
...more than the Bone Collector which has a more comfortable handle for heavy use but is excessive for most applications and has a heavier blade and edge-geometry...
...and more than either the SAK or the stockman though I concede that either has greater utility, but the lack of one-handed opening and a secure blade-lock...
But in truth, I'd probably skip even the Caly in favor of my Leatherman Charge TTi (sorry no pic of that one, I should remedy that). That multitool beats all for versatility and goes everywhere in my pack, but i don't usually carry it on my person due to the weight and the fact that I can usually get by with a lighter folder and my Gerber Dime (which i prefer to the LM Squirt PS4 due to poor experiences with excessively tight construction).