Whilst I agree with everything you say Tao (as I said in my post some way back), I wonder WHY would one want the work of a prime in a wedding situation? I am absolutely certain that the Bride and Groom aren't going to give a toss about the tiny difference in quality of two identical images one taken on a 50 prime and the other taken at 50 on the zoom. However if the shot is out of focus or even missing because of a failure to get a sharp one.....
I wish I could post some of a wedding reception that I only shot with a 50mm 1.4 and the fuji, but the bride and groom asked for me not to post any so I need to respect that. I do have to say they turned out great, most were black and white and each shot was focused on one or just two people with few group shots(at their request). I worked with another photog who just used a 17-55 (w/ DX) and even I was surprised the difference in looks and that doesn't happen much for me. The bride had given me a few links to some photographers who shoot only with 35s & 50s (Leica but she didn't know that) and they were masterful with just those two lenses.
The trouble with using primes is the speed of some of the "events" - I.e. "quick family gathering right after the nuptials-leaving the church-into limo" and "entering reception-taking place at head table-cutting cake-first dance" to get those key shots a Zoom for speed is really helpful. If you have an active group, it can become a necessity.
The planning, checklist, speed of moving, double checking focus, etc. turned me into a sweaty mess by the end of the night and I had about 3x more photos - uggh! That added about 15hours of more post. Priced that one wrong. If I for some reason did more weddings, I would want the 24-70 on one body and a 50mm 1.4 on the other for the reception and a 24-120 f/4 - 70-200vr combo in the church.
For anyone reading my thoughts, Note that I didn't do any of the Formal sittings at all - the other photog did most of that before the wedding. It was a pure documentary style - and nothing more. For the formal stuff, I would add a 85mm, 60mm, 105mm (dependent on wedding) and probably a 16-35mm set at 24mm most of the time. If I was lazy I would go with just the 24-70.
Go for the primes. I´d get the 24mm instead of the 35mm, as you can always use the crop mode or stick the lens on a DX body to get the 35mm FOV if needed. And If you want to save some dough, the new Sigma 35mm 1.4 is the sharpest 35mm available.
When I shot only the 35mm & 50mm I did want the wideness of the 24 many times. I had a 17mm I used a few times, but swapping lenses became too time consuming.