“It is great but there some thing should be added to make it perfect IMHO.
First in the Office lens there should be rotating function since it is not avaliable in the OneNote WP app (rotating Picture effects OCR recognition).
Second, multiple pictures from gallery could be imported at once. it is a pain if you want to add 6 or 7 whiteboard pictures into same note.
Third, that would be great to pick pre-created OneNote sections to add the scanned file. (like adding screenshot to current section in OneNote on PC).
Fourth, pressing camera button in OneNote WP app should give an option to user to pick normal lens or Office lens.