Well the Star Wars EU is such a mess that power levels are all over the place, and there's certainly some versions of SW canon that would beat 40k. Specifically I'm talking about the part of the EU where Starkiller and the Sun Crusher live.
yes and no. If you follow the rules of Star Wars cannon then the powerlevels have to conform with the movies. That gets rid of a lot of the really overpowered weapons.
So anything that does normalize Star Wars powers quite a bit. Starkiller is a tricky one because they tried to make him fit into the EU canon however he still breaks G-canon which makes it so he can't really exist.