There seems to be a common misconception that we are unable to comparatively assess the level of various Gedolim. We can compare “levels” – in fact, we need to in order to judge who is an authority in the first place! If you can’t compare levels then how are you to know that someone is a godol? The fact that he is “accepted” as a godol only means that many people have judged his “level” to be that of a godol. But if you cannot compare levels, then these people have no right to accept him as a godol in the first place.
And the same common sense that tells you so-and-so stands out among his peers making him an authority, tells you that certain so-and-so’s stand out even more.
Or less.