You have to take into account that there's one big difference between
focal blur and antialiasing:
  Antialiasing is triggered when the color of *adjacent* pixels differ more
than a threshold value. There are many places in the image where only one
ray is shot for the current pixel and that's it.
  However, focal blur shoots many rays for each pixel (I don't know exactly
how the algorithm works) and then (I think) shoots even more rays if the
difference between the previous ones was large enough.
  Also the "samples" taken by the initial rays are dispersed a lot more than
antialiasing pixels (focal blur can extend over an area equivalent to tens of
pixels) which means that there will be a lot more variation and a lot more
chances for the samples to differ over the threshold.

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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