I purchased the kit lens with my camera. I got it to replace a crappy sigma 18-55mm 3.5f....The kit lens was worlds better than my old sigma, but it still left some to be desired.
Don't get me wrong, it's a great lens, and can produce very sharp images. But it is not very sharp at all when it is wide open (and wide open is only 3.5). I find I really have to step it down to 6.3 at least to get any clarity I am happy with.
I don't know anything about the 85 1.8, but I agree with the above comment that the kit lens wont be good for indoor photography. With that said I am very happy I got the kit lens, most my photos are on a tripod anyways, so I can step it down, or use another lens.
My next lens purchase will ether be a sigma 150mm macro or canon 100mm 2.8 USM macro (the canon 100mm might be a good lens for b-ball if your not dying to have such a fast lens, and could give good use for tank photography too, sigma makes a 90mm that is a bit cheaper and might be worth a look too).
Hope that helps, and I am not just rambling