I think if you are constantly cutting materials and find you are frequently sharpening S30V, then M390, S90V, S110V, Vanax, CPM-M4, SuperBlue, ZDP-189 and other steels in those respective classes will probably give you a nice benefit that justifies whatever premium price. One particular one may suit you best, but in general I think going to a steel with higher wear resistance could benefit your usage. These high wear-resistant steels perform super-exceptionally well when cutting abrasive objects (ex: cardboard, which is very hard on edges and quickly dulls many good steels).
I'm personally finding that as I use M390 that I am comfortable taking the angle down very low and that, despite the angle being low, the edge still resists deformation significantly better than a steel like S30V (nothing against S30V as it is a great steel). At that super low angle, the knife is more effective at cutting, and cuts super cleanly. The tendency of any larger volume of cardboard to dull most blades is contrasted by M390 which functions like the Energizer Bunny in that cardboard is no match for it. CPM-S90V and CPM-S110V also give real-world performance in which their serious wear resistance translates to actual usage of extended time between sharpening and the ability to grind a very thin edge and have that edge last. I also find I can maintain M390 pretty well (but it does take me longer to sharpen than other knives because ceramic stones don't remove metal nearly as fast) and that M390 has spectacular corrosion resistance, which to me is very important on a folder.
CPM-3V seems to be really a beat-on-it sort of steel. It's primary feature is that it has unusually crazy toughness and it makes 3V a good candidate for larger fixed blades and knives that will see things like shock, impact, prying, flexing, etc. (many things one would ideally not want to do to any knife if avoidable). In terms of how well 3V can hold an edge, it's by no means a slouch but edge holding isn't it's golden ticket selling point and so for a knife frequently used for cutting that is not involving tasks in which extreme toughness is needed, some of the above steels could be a better choice.
Going off of your first post, I am guessing you prefer to have a knife with that 'scary sharp razor edge', and that you sharpen once that scary sharp is lost and the edge is then a 'very-sharp-but-not-quite-scary-sharp' edge? If so, I think you will really like M390 (and other steels with similar performance). Where as S30V seems to go from the scary sharp-->very-sharp-but-not-quite-scary-sharp pretty quickly, I find that M390 retains it for a very long time, even after cutting numerous and many objects. While I am still learning the sharpening and my preferences, this is a feature of M390 I am really starting to like as it is reducing the frequency touchups by quite a bit.
