No it's not you. By comparing the freq. responses between both mics, the Audix F12 is eq'd at the factory to respond to lower frequencies, 100 hertz and below (yellow boxes), which is why is sounds dull compared to the GXL1200. The other reason why the GXL1200 sounds crisper is due to the fact that the GXL1200 holds just a tad below 0db at 20k (green box) where the F12 drops to -10db at 20k (red box). In my humble opinion, your ears are hearing the difference in design and engineering rather than if one is 'better' than the other.
Audix F12:
CAD GXL1200:
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