Elmax or M390 would be better than S35VN or CTS-BD30P in nearly every aspect other than toughness for M390. Better hardness, wear resistance, corrosion resistance, grain refinement, edge stability. Not cheap, but certainly a premium steel.
I do agree that the other two would better compliment a hard use knife, but exactly how hard use does a knife have to be? Did somebody ever break the old Manix 2's blade in S30V often enough to spark a desire for a tougher steel? From what I've read in the past, the lock failed long before the blade ever did. And I think in every hard use video Ankerson ever made, problems don't emerge until the spine gets whacked, the folder is batoned, or the folder gets used as a prybar. I think for most sensible people, hard use would stop at whittling the 2 by 4.