Without having one of those four mic things to compare, I have no real reference on if they make a difference. On my Sordins, and the older Pro Ears before them, all I can say is that I don't notice "non-directional" sounds to any point where it has been an issue for me. I guess thinking about it now, I maybe notice a non-directional input close up, like when loading magazines or something if my eyes were closed I couldn't pinpoint the noise. I'm pretty sure I turn my head in the direction of sounds I hear farther away.
I've actually not thought about this much and will have to put my Sordins on tomorrow and walk around a bit to experiment, as I'm now curious.