MBS-26 is a proprietary steel to one maker. That is why you won't see it around much.
I personally prefer this steel in the kitchen to any I've tested so far.
It grinds very thin and still maintains excellent tensile strength. Corrosion resistance is up thee with 440C.
Edged retention actually better than most steels despite the lower carbon content (.85 - 1.00). It is more expensive.
I asked the maker how they were able to achieve such extaordinary results with the lower carbon content. They said that the steel is one of those ideal combinations but requires very exacting heat treat. After watching their heat treating process, I was impressed. Blades are pulled from the heat source (which I cannot disclose) in groups of 4, spread by hand and individually hand quenched in oil. the crafstman performing the task was indeed a master at his art.
Mind you, they use robotics for basic grinds so they are not technologically deprived. the results are obvious.
We will designing a more upscale kitchen line next year. Same steel.
sal