If you can't tell the difference in a shot, then it really doesn't matter, does it?
As a pro, I'm bothered about what my pictures look like rather than any possible optical flaws. If you don't like it, remove it regardless of if it's shadows or fringeing. If you're happy with it aesthetically, it doesn't really matter which it is.
Looks fine to me, so I wouldn't bother looking closer so long as it still looks fine at any size.