I recently conducted a small mic comparison with several different chromatic harmonicas. The mics are kinda not what I would have liked to have but they'll do for now until I get my close-miked session underway. I would have loved to test out an SM7 & maybe some ribbons but oh well. Keep in mind that a chromatic is not a diatonic and the players really have no desire to have a overdriven sound. A person playing some Mozart stuff can't do it with a diatonic but can with a chromatic. My first time doing this, so go easy. This really is a lot of work and now I have a new appreciation for the fellas who do this kinda stuff.
http://slidemeister.com/media/mic-test-1/mic-test.html

The dynamic mics:
AT 814a
Audix OM-2
Audix i5

The condensers:
RODE K2
CAD E-100
Oktava MK012

Mackie 400F was used for preamp & conversion.