I own both, and other primes as well. The zoom has the upper hand in flexibility, and I think, less chromatic aberration at wider apertures. The 135 is a nifty lens, yes, but flat-out, it's the wrong length 80% of the time, so you cannot shoot fluid,dynamic situations without constantly needing to move the camera. I also prefer an even longer lens length much of the time, so the zoom also offers that important 150 to 180 to 200mm end, as well as the very-useful 70 to 85 to 90 to 105 to 120mm range, where a lot of situations seem to end up being framed at. I shot a long portrait session yesterday outdoors: I took an 85/1.8, deliberately left the 105 and 135 at home, and took the 80-200 AFS. Worked out great. Made 97% of the shots with the 80-200; near the end of the day I did one pose, about six frames or so with the 35mm lens, and one single pose, five frames, with a 24mm.