hello bro, Ultra wide angle lens photos will be different compared to the wide angle lens bro. but only when we zoom, we notice the quality difference. if you are seeing poor image getting produced even without zooming the photo then do check camera settings once. if you have enabled any filters or camera settings adjusted or not.
if all is good, then its good to check with apple service center once. do shoot some outdoor day time photos to show the comparison and they will be able to check once for any defects.
Do share couple of sample photos here, if you want me to have a look.