It is true that state that a character has an incredible power, it does not necessarily more powerful than all the other senses Ki above, but still, I would think that Goku SSJ (combined energies)> Vegeta SSJ2 (Enraged)> Bills (ultra deleted) because Krillin Goku thought he had become a God, in spite of seeing how incredibly powerful it was Vegeta SSJ2 (Enraged), but as Piccolo is much better judge than Krillin, he realized that the power of Goku SSJ (combined energies) was not much more powerful than Vegeta SSJ2 (Enraged) and Bills if it was tremendously more powerful than Vegeta SSJ2 (Enraged).