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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.