Usually, yes—but it depends on the specific lenses. At the same aperture, a prime often still has an advantage in sharpness and optical corrections such as lower distortion and less purple fringing. Community examples comparing Canon kit zooms with 50mm and 35mm primes found the primes noticeably sharper, sometimes even in the center, with fewer optical artifacts.

A key reason is that zooms are more complex designs and are often weaker near their maximum aperture, while a fast prime stopped down to f/5.6 is no longer working near its limits. So a 50mm f/1.8 at f/5.6 is often in a stronger part of its performance range than a kit zoom at 50mm f/5.6.

That said, this is not universal. Lens quality varies, and some zooms can match or beat some primes. Camera body and autofocus behavior can matter too; a fast prime may also enable more accurate AF on some cameras.

So the practical answer is: primes often still look better at the same f-stop, but the only reliable way to know for your gear is to test those exact lenses.