what would be more interesting is a comparison like the ones Gordon has.. two different lenses at the same settings.
in this case, since you have reviewed and have access to both the kit lens[ 18-55] and this prime lens.
can you set up a picture such that the kit lens is zoomed in to 50mm focus and both set at the same aperture? [ except where in applicable .the kit cant go to 2.8 ]
I don't have the 18-55 kit lens, I bought my XT body only and got the 18-55IS but here is a lens comparison between the 50/1.8 and the 18-55 IS
Shot settings pretty much the same : ISO 100, WB - shade. I turned IS off since it was on a tripod and left mirror lock up off since I didn't use it with the 50/1.8
18-55IS @ f5.6
50/1.8 @ f5.6
18-55IS @ f8
50/1.8 @ f8
18-55IS @ f11
50/1.8 @ f11