I shoot mostly children, families, events with people, I've done an occasional wedding though not what I want to very often, but mainly tell stories with people in the shots.
I have a FF, 5D Mark II.
I have rented all the lenses I want; 14L, 24L, 35L, 50L, 85L, 135L etc...and I've scoured through all my shots in LR4, sorting by lens, and my favorite, most sharp shots are all done with these lenses. The zooms seem to have some softness to them, while still excellent and versatile, something compared to the primes doesn't seem to match is IQ.
I will never regret the decision to buy the 24-70 and capture the images of my first sons birth, which was 4 weeks earlier than expected, and so I had to learn how to use the camera and that lens sooner than expected. I'll always appreciate the zooms, but I think I've grown enough in my skills to recognize some of my images could be a lot better with the primes. And learning to use my feet with them instead of relying on the zoom, is something I want to do to help expand myself as a photographer.
You posted this all the way back in June, so I'm not sure if you've made a decision yet, but I thought I'd offer some learnings that I've gathered from this rather expensive hobby.
1. Don't buy primes too close together!: This is a big one if you're on a budget. Buying a 50 and 35 and 85, for example will will probably see you leaving one or more home all the time. I think lots of folks choose 24-50-135 or 35-85-200 or some other amalgamation. give yourself more credit for being able to stretch the usefulness of a prime at least 20mm.
2. make sure you cover your minimum and maximum focal lengths: Unless you can afford the expensive L's these ranges may be better covered by zooms. if you decide to go with a 24 or 35 at the wide end, but you like to take landscapes, it might be a good idea to include a 17-40 in your budget. The same can be said for the other end. If you often like shooting 300-400mm a 100-400 may cover you better than a 400 f/5.6 or trying to pony up the cash for a 400 f2.8.
I guess it was only two points... hardly enough to warrant a list, but oh well.
Anyway good luck with your new lenses! it's always exciting!