I think your needs maybe satisfied... OmniOutliner will be coming to the iPad. It's the nearest I've found to OneNote on the Mac. (And Evernote should not be compared to OneNote, very different products!)......
No way. The best and most unique feature of Onenote is the free-flowing/container based of note taking. No other application is like it except for Zoho's Notebook. It's more of a hybrid mindmapping/journaling/note-taking application all together.
Outliner is an outlining tool/structured note taking, completely different from both Evernote and OneNote.