...here's another bit of info: the camera was imported from maya, but I've just tested with a second camera created in AE from scratch, and I'm having the same issue...
Also, if I toggle on/off the collapse transformations on my precomp, I can improve the fuzziness, depending on which part of the artwork I'm working on... so that's helpful, but not ideal.
You might be seeing artifacting due to Pixel Aspect Ratio Correction if you're using non-square PAR in your comp(s). In your preferences, check to see if you have the Zoom Quality setting designated to "More Accurate".
If not, then as you noted, you probably have some effect enabled in Illustrator on one or many of your layers/objects that is causing the aliasing.
it was the "zoom quality" setting--thanks a lot!!