Notes 8.5 and Omnifocus work pretty ok together. With both apps open I can drag an email into the notes section of an Omnifocus todo and it will create a clickable url to the original Notes email. The original mail can be filed in Notes and will still be opened when you click on the notes:// url in OmniFocus. I still need to type in the todo description however myself.

Nicer would have been to be able to post it like from Apple Mail with shift-ctrl-command-. but I guess that is upto IBM to arrange listening to those services. I tried dragging a Notes email and dropping it onto the Omnifocus icon in the dock. That results into a script error, too bad. Would have been very nice to see that work.

So the net is: it works, but can be done nicer and more efficient.