Well.......
I have MHS in my 2018 ES-335.
I have CustomBuckers in my 2016 R9.
I have Burstbuckers in my 2009 R9.
I find that the CustomBuckers are the brightest, almost thin, sounding of the three. The Burstbuckers are smooth....with fairly even response across the spectrum. The MHS have the rawest, most organic, sound.
I have to say that, in my own little opinion, the MHS are the best of the three. They really do deliver a "vintage" tone very much like the recordings of guitar from the 60s - 70s.
Memphis Historic Spec. I think they nailed it.