The payout is the same as the hi5, with 50% going to the jackpot (after the takeout) if there is more than one winner.
I think M1 does right with the hi5 with a higher percentage paid back to the winners. It often makes the hi5 a better bet than the superfecta.
On the other hand, I often believe the the superfecta is a better bet than the hi5 because the super played for .60 or more often pays better than the .20 hi5.
It'll be interesting to see how the jackpot p6 will do, but I've got to think that the p4 will be the better play. Looks like the jackpot p6 starts on r5.