My Spyderco ZDP CF Caly 3 has a backup. For its size that knife is perfect in every way, especially after you take the edge down to .005" thick.
Of course I have multiples of the Spyderco Military (BG-42 and S90V), and two Spyderhawks (SE and PE), and three Enduras (ZDP SE/PE, and a SE E4W).
Then the Kershaw Volt. Straight forward design with nearly everything just the way I like it, and it was executed brilliantly.
And two Shallots (S110V and ZDP), and two Blurs (SG-2 and ZDP).