I would guess close to 0% of people, IFF we're looking at the photos side by side on a phone screen, or
maybe a crappy laptop screen.
Put them both on a hi-res display, or HD TV or (even better) print them out in large format. Then there's no comparison.
So it really comes down to how is the photo going to be used.
And for 99% of photos taken these days, viewing it on a small screen is the purpose, so the phone camera is perfectly good enough.