what's the advantage of 85mm, say to the other 2.8 zoom lens or my 25-105 F4 IS? is it worth it? maybe its around 500 bucks?
with a 500d, f2.8 is not fast enough for indoor shots without a flash. 24-105 is a great walkabout lens, but i wouldn't recommend using it for taking pictures of kids.
and not to mention, the bokeh of a fast prime is simply irresistible.