Just remember, resolution is not equal to acuity (or vice versa). Just because you believe something is sharper and more defined doesn't mean that there's more resolution. What a lot of people are seeing is that the anti-aliasing is gone and edges have more acuity (and potential other issues, like stairstepping or moire).
That said, an AA filter will "fuzz up" resolution right around its filter point, so there can be some modest measured differences in resolution between a non-AA and AA equipped camera. In my experience, that difference has been below the threshold of visibility in normal image presentation (it takes at least a 15% resolution increase to be visible to most people, all else equal).