The Neumann KM84 is one of my favorite microphones.I've not had hands on an actual KM84
Its main drawback is that it's discontinued for a while, and second hand prices are getting crazy.
Its replacement, the KM184 has this "à la mode" high frequency boost, that increases "air", but is usually just too much of a sound coloration.
I own a pair of KM184, and they are excellent, for sure. But I whish I coukd own this pair of KM84 I was able to rent several times.
If those Warm Audio WA84 are that good... I may give them a try.