Confirmation on Anakin > Sidious / Yoda
Here's a quote from Nick Gillard in 2011. In this, he's only using a eight tier system (removed tier ten and one and then scaled down, seemingly), but the point is obvious:
"There’s up to eight levels. Yoda is an eight, Mace Windu is an eight, Obi is a seven, but if you miss a level, it’s a bit like taking drugs to get enlightenment.” Anakin is the perfect example of messing with the established system. “I’ve got him down as an eight or nine, which doesn’t really exist,” says Gillard, before explaining that by turning to the Dark Side, Anakin skipped some essential steps. “It’s only a writing tool,” he says, “but it gives you the edge over it just being a fight."
In the context of the ten tier scale, Anakin is nine bordering ten.