It all depends what you want to do, and/or how you define quality. Zooms often have a slow aperture, such as f/2.8, f/4 or even slower. A fast 50mm will provide other creative. Or e.g. the minimum focus distance is not so good when compared to a macro 50mm. Etc. What are your concerns with your zoom?

However, no lens will in itself make an image better; 99% of the image quality comes from the creativity of the 20cm behind the viewfinder. For years, I have used mostly lenses from the 1930ies to 1950ies, these are not as advanced as today’s designs, but also do not prevent someone from making great images Same goes for the modest 16-50 2.8 zoom I currently use on my K3iii Mono; it’s just that I prefer shooting primes.