Maybe it's the headphones we use. For mic evaluations I prefer AKG K240DF phones, because they translate to the recorded sound very well, at least in my experience. I can't say I was ever surprised by a mic sounding different over speakers. Plus I'm a badass mic nerd, I can hear most of my mics in my head before I actually put it on the stand. What does surprise me is that performers often prefer different headphones that I find almost unbearable (mostlly for their overwhelming bass response). But different people have different ears, so I have a number of different headphones models.
We're getting way off topic...