“The comparison also illustrates the limitations of the iPhone 7's f/1.8 aperture. That very low number means that you are going to have very shallow, flat, slightly blurry images. With its f/2.8 aperture, the Olympus lens just creates a sharper photo with a better sense of depth than the iPhone can.”

This entire statement makes my head hurt. If the shot is composed well, shallow depth of field creates a much better sense of depth than the longer depth of field you get from a smaller aperture. Those shots were also taken at vastly different focal lengths due to the zoom lens on the Olympus.