I own this phone, and the camera is a big step up from my 3 year old axon 7. As far as 'not the sharpest photos' goes, often in portait mode the vivo camera does a lot of automatic settings, that adjust beauty and light. sometimes this doesnt go well, but probably 85% of the time, if I'm patient, I get a terrific photo.
With GCAM, I have had success with GCAM 7.3.020, modified(m_7.2.010_Urnyx05-v2.2.apk) for taking astrophotography, but sometimes the app does crash with regular photos.
from this guide
https://www.ytechb.com/download-google-camera-7-3-for-iqoo-3/
I am happy with this phone camera. It is better than my wifes Redmi Note 8 pro. I cannot compare it with other, similar priced or spec'ed phones.
Hope this helps.