The sharpness is where? There is not a single point on this image which is sharp:
https://forums.androidcentral.com/a...-s9-plus-camera-defective-20180406_101323.jpg
This is definitely not a depth of field issue, there is more to this. Multiple photos in this thread have shown this. This is aggressive noise reduction.
And even if it was just a depth of field issue (it isn't), then Samsung shouldn't be using f/1.5 sensors on a phone. Either way, this is a bad camera for anything other than photos in pitch black environments.
Also, one more thing about aperture: the LG V30 has a f/1.6 aperture and does not have these softness issues. So I do believe that whatever Samsung is doing, it can be fixed in software.