Upload & Sell: On
zooms vs primes is kind of a pseudo-debate. it's not either/or, practically, it's what do you need. imho, the most reasonable answer to the OP's question is "both."
if you want to make very shallow depth of field, bokeh-luscious pics, a fast prime (meaning f1.2-f1.4) will do it best. if you're going to make event or documentary pics from various positions, shooting single to multiple subjects, a zoom will do that best. if you shoot both, i guess you can try to cover both bases with a "fast" zoom (a fixed aperture f/2.8). or, buy a multi-aperture zoom and a fast prime. or, buy a fast zoom and a fast prime, if your budget allows.
and on the other hand, there are lenses that just scream "use me" and you adapt your subjects and compositions accordingly, like the 85L or the Zeiss Distagon 21 f/2.8, just to name two.