Here's a slightly different workaround that doesn't require any lambda expressions:
var('z,z0,x,y')
f=abs(1/(z-z0)).subs({z:x+I*y,z0:1/2+i})
ff = fast_callable(f,vars=[x,y],domain=CDF)
plot3d(ff,(x,-2,2),(y,-2,2))
-Marshall
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