Originally posted by bdery Primes are also smaller, can be faster and make you shoot differently.
The last point mentioned here, is often underetimated, I guess.
As stupid as it may sound: By limiting your possibilities on purpose, you approach things differently!
With a large zoom your eye sometimes 'looks' for any interesting motive (at different distances/scales).
But with a prime on your camera your eyes adapt to the frame of this lens and you start to hunt much more for suitable motives.... this really gives different results and a very different feel!
So in principle you could have taken a similar shot (with similar/same IQ) but in practive you might not even have seen and considered the respective image.