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If you go to the Optifade website, you will notice that Beretta is their only listed gun maker. This is most likely why you can only find this pattern on the Beretta and Benelli shotguns. Give it a year or so, other manufacturers will start to use it if there is enough demand for it.
I'm looking to purchase in the next couple of months so I guess if I want Optifade its either the Beretta A400 Xtreme or Benelli Super Vinci. I was worried that the Optifade pattern was working so well that I just couldn't see the other guns.