The depth of field is also dependent of the lens diameter. The small lens diameter in mobile phones yields larger depth of fields than DSLRs with large lenses,

The depth of field is also dependent of the lens diameter. The small lens diameter in mobile phones yields larger depth of fields than DSLRs with large lenses, so the drop to 1.8 might be more than just "slightly more shallow" (haven't done calculations, if somebody has a link, it would be appreciated). Using 2 cameras, the new iphone still relies on simulating shallow depth of field by blurring the background from the calculated depth information and fakes the bokeh with blur. The result could be a differentiator for the new iphone, or it could not be. Looks a bit too fake for my taste in some situations.