Kinda depends on what you consider edge retention, cutting longer or staying sharp longer are different.Just out of curiosity what steel has the best edge Retention?
I would go further.Also a reality check, you want better retention? Be a better Sharpener.
Rex121 and maxamet. They Excell at edge retention but have many cons. Ie sharpening takes forever not very corrosion resistant, possibly chippy. Not hard use. Rare and expensive. Spyderco and Creely blades are two offering them. Iirc DeadboxHero had some maxamet recently.
You may be better off with 20cv, 204p or m390 as with a good heat treatment they are the most balanced super steel. Or heck vanax super clean if you want a custom.
Is there a thread anywhere here that makes general comparisons between the steels? My preference would be edge retention and ease of sharpening. I'm not worried about corrosion resistance. To be honest, I kind of like the standard tool steels. D2 A1, etc.