PM has a compairson on the shelves of the Subaru H6 Outback and the Ford Freestyle V6.
It shows various different things but draws a vague conclusion.
It does show, however, that the H6 250/219 5EAT SS has a very similar 0-60 time to the H4T 250/250 5EAT SS: 7.87 compared to 7.1 seconds (C&D).
Now I don't know how Popular Mechanics tests but Car and Driver really put pressure on the cars to get the best times. This must be good news for the H6.