Hmm... I haven’t tried 0.1u diamond.I did about 150 laps on CBN pasted balsa on a razor that had been honed to .1u diamond. Same razor I used yesterday and couldn’t tell any difference. I’ll keep at it
Going from 0.25u diamond to 0.1u CBN does produce phenomenal results.
But going from 0.1u diamond to 0.1u CBN will surely make only the tiniest of differences in smoothness - perhaps imperceptible?