If people were all the same we wouldnt need to use any sort of benchmark. Alot of people go on about how we re all different. Past the obvious parts such as genetic and behavioral variations within a species being advantageous, these sort of statements are the sort of equaliterian bullshit that d have everybody be the same because while they all want to be "better", people in average just dont have the balls to be bold about it.
Its fine to say that someone is taller or runs faster than someone else but somehow everybody is "just different" when it comes to feats of the mind.
Athletes are different too, yet nobody think it strange to call a person more athletic than another even if the fields are quite different.
Past things like iq, some people just have brains more able to build complex neural activation paterns and switch faster between them, have a better myelination of their brains, more energy efficient neurons.
Thats "quantatively better", independantly from any particular qualitative variations in the brain to behavior translation.