That link I posted talks about what they think the composition is and the HRC. I think it said hrc 56, so yeah, pretty soft.I’m surprised that you found a steel spec for SAK. My understanding was that Victorinox uses a proprietary steel on their knives and doesn’t publish its specs. Of course, I’ve never gone looking, so I can neither confirm nor deny that assertion.
From what I’ve heard, it is a relatively soft stainless, so it’s easy to sharpen, but doesn’t hold an edge well. Mine have been really good at holding edges, but I only use them for trimming broken fingernails—for any harder use, I go for one of the “real” knives I carry, usually with an S35VN, S90N, or Magnacut blade.