Another data point: Since doing this video a couple years ago I have had the chance to compare the 78's to the Slash 2.0. Without a doubt the 78 has more bass and highs, and is more scooped in the mids. The Slash 2.0 has less bass, and more upper mid content. At this point in my journey I have mostly moved on from the JB, towards lower output pickups.
But the key is always to get the right pickup for the guitar, and what works in one doesn't always work in another.
So wierd....it's almost as if there are other factors that affect the sound of an electric guitar besides the pickups.