Benjamin sums up well common uses for a KM86.
The mic has a sound of its own, and does not share all that much timbre with the KM84, despite using the same capsules. Smooth and gentle comes to mind.
A lot of the acoustic energy, particularly in the high frequencies, is deflected by a quadruple screen before it reaches the diaphragms.
The direction of the capsules, vis a vis the mic body, the acoustic effect of the head basket's size and shape, the proximity of the rear facing capsule, the four mesh screens before the diaphragm all contribute to the unique sound of the KM86.
For addiional info, please go into the archives. We had a very informative thread on the KM86 a while back.
Kind regards