AKG C414B: overall louder
AKG_C414B.png

AKG OT100
AKG_OT100.png

ECM8000
ECM8000.png

MCM88:doesn't really peak at any frequencies, but it drops
MCM88.png

ND257B
ND257B.png

VTECH VTND3
VTech_VTND3.png

he "instant" screenshots often drop out somewhere between 1013 Hz and 1178 Hz and again around 10120 Hz, but the peak screenshots stay more equal throughout the whole sample.
The VTech VTND3 had the most consistent pickup of frequencies, with pretty much no major peaks or valleys.
The AKG OT100 and the ND257B had the most peaks and valleys (in the peak screenshot) in terms of represented frequencies.