I have many fewer SAKs than the other respondents of this thread. However, unless a challenge that I am participating in disallows it, I typically carry a Super Thinker in my pocket and a Classic SD on my keychain.
Guilty. Sometimes if I'm carrying a 6+ layer SAK, I also carry a 1 or 2 layer (like a Tinker or my new Excelsior) so I don't have to rely on the wide SAK's off-center blades.
Yes, at least two. 58mm on the keychain - Signature Lite or MMC. …and whatever else. Nice thing is the 58mm backup gives freedom from the old tendency to grab something with plus scales.
Victorinox Einstein perhaps
Who said something about Victorinox Einstein...?