The F111's isolation, if worn with a good seal and a deep fit, is pretty much as isolating as it gets with universals. You can probably get more isolation with Etymotic and their triple flanges, but they feel horrible to my ears, and that's why I far prefer the F111. The customs-like isolation is difficult to achieve; it behaves differently from universals.
which tips works best with u? the ortofon tips? interesting to get them but abit ex. currently using sony medium hybrids with de-cored complys