well i've not yet used viz 4, only viz 3, but try this -
1) supersampling - try messing with these settings for the main material
2) material filtering - the standard is set to pyramidal, change this to summed area with a value of 0.5 Try this for both diffuse AND bump channels.
3) rendering filters - try a different render filter other than the standard area filter. try catmull-rom maybe.
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