When I bought my first APS-C sensor DSLR I wanted to buy my first prime lens.
I was told 35mm lens is equivalent to standard normal view 50mm on a 35mm sensor .. and the 50mm will be the equivalent of 75mm ..
I therefore bought the 35mm just to get the surprise of my life .. the 35mm lens did not behave like a 50mm when it came to perspective and distortion .. it kept its usual wider angle perspective .. just being cropped meant the image appeared as if it was more zoomed in due to the cropping ..
I returned the 35mm lens straight away and replaced it with a 50mm that behaved as expected exactly like a 50mm lens and not a 75mm when it came to perspective and DOF .. only the DOF was more deeper compared to the same lens and aperture on a full frame as it took the same shot from further away !!
People argue about zoom lenses and prime lenses and which are better ..
Here is the score .. Some really expensive Zooms can be quite sharp and high resolving as primes and are definitely more practical ..
Primes will remain cheaper, smaller, lighter, sharper, allow in more light for same aperture due to less loss of light in transmission, and need more discipline to use and more hassle to carry several lenses and change in the field ..
Basically if you are out photographing different things on the hop then zoom .. if you are photographing an occasion or a set piece or in a studio or macro then go for prime .. or if you are learning or if you are advanced and want to convey an artistic message or if you want to go really crazy with f1.2 and achieve a really blurred background with an extreme Bokeh .. or if you want maximum light for very exact focusing .. then prime ..
So for anything artistic and not in a hurry prime otherwise zoom