I have come to the conclusion that a super steel has its pro’s and cons.
Sure M390 is a great steel and holds a edge very well. Leave it on a shelf or use it sparingly and the blade will stay sharp for years.
But using it as a EDC from a person who uses their knife daily and you better be prepared to spend some money on good stones or spend a half a day sharpening it.
Keep in mind that a steel that has a high HRC rating 60 or above is as hard or harder than most metal files you use to remove metal.
That’s the con with super steels, if you get the right sharpening setup for super steels that’s not a problem but it’s expensive.
To me D2 is about the middle of the road whch I prefer in a EDC where I may have to sharpen once a month. I think S30V is also a good choice for EDC although a little harder to sharpen.
Choose the steel that best suits your needs for your use, as the hardest, most durable, most corrison resistant, best edge retention steel may not be the best for your use.
Just my two cents. 