Like most have said, the standard lens will be 100% exactly completely identical in every way. Using the zoom lens, in very bright outdoor light, the difference will be extremely minimal, if any (the shutter speeds will be so high it won’t matter). In medium light there will be a difference in the steadiness of a shot and probably clarity since it won’t need to use a high ISO. In dark light, you’ll have a brighter/steadier shot with less noise.
Those last points might be moot, however, because the default camera in iOS only activates the zoom lens in bright light. In medium/low light, the phone just uses the digital 2x zoom. However, that threshold of when the zoom lens activates will probably change since it can now function in lower light. I assume in night shots, the software will still stick with a digital zoom but I could be wrong. You can download apps that bypass all that though and force the zoom lens.
