Right now I would bet alongside you Shawn. With 4.5k being enough for 4k resolved, that means that 5k has some extra room to spare. And if 5:1 is the gold standard with virtually no compromise, then 7:1 definitely sounds like a good place to be. It will come down to each running their own tests of course, but it won't be far from 7:1, and perhaps even a tad lower.
It is so nice and such a relief to know that this beast of a camera comes armed with REDCODE.