Thats not how I would describe those mics at all.
Sm81 - just a mic.... doesn't seem to do anything much to the sound
KM184 - lots of air, not a lot of lower warmth like the older KM84's.
Neither of those descriptions were intended to be bad. Both mics are great and useful mics. It all depends on the source signal, what you are after, and the rest of your chain. IN my opinion the sm81 and KM184 offer a good contrast and it would be very useful to have both.