Reports indicate that it does appear to make a difference, at least reproducible enough that Steve Hernandez was convinced to add the feature to Creation Workshop.
There’s a discussion of it here:
http://buildyourownsla.com/forum/viewtopic.php?f=8&t=61&hilit=antialiasing
http://buildyourownsla.com/forum/viewtopic.php?f=5&t=119&p=468&hilit=antialiasing#p468
Given that Creation Workshop has an easy way to set up the level of resampling for anti-aliasing (the poster in the forum who produced a side-by-side example did it in photoshop at 3.5X), it should be fairly straightforward to do an experiment with something like no antialiasing vs. 1.5x (default) vs. 3.5x (watsonstudios test).