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So I don't have any other 4k - and although very pleased with my results I'm still a honing FNG. And I remember the cautions about the 4K surface on the Norton 4/8 when I bought mine. I expected to...

I pulled my out this evening and the plastic box says: 4000grit made in Italy - 8000grit made in USA
Sorry now that I did not measure it before to get some idea of how much I removed.

There is a much smoother surface below...just waiting for you to mine (lap) down to it..
I remember my stainless steel sink looked like I had dropped a bucket of white paint in it by the time it was...

The 4K side of my 4/8 Norton was gritty/rough until I lapped a substantial amount off.
And if I am recalling correctly this was not a surprise - as in: "expect to have to lap down 1/16" - 1/8" to...