Additional baggage allowance is not a OneWorld benefit. Most airlines permit an additional baggage allowance for their own elites, but there is nothing available based on OneWorld status.
OneWorld benefits include lounge access and priority check-in. Most airlines also permit priority boarding and baggage handling for alliance elites.
If you want more checked baggage allowance, then convert to a OneWorld Explorer or Global Explorer round-the-world fare. By virtue of the fact that such a fare sees you including travel to/from USA you get 2 x 32kg baggage allowance.