Though in low light this could be another benefit, shoot at f1.4 for the shutter speed but get the dof of f4, win win. Unless you wanted very shallow dof!
Great idea. 1.4 or anything under 2.8 has razor-thin dof's. Sometimes that's good, but often it would be preferable to get a little more dof while still enjoying the shutter speed possible with a wide aperture. I'll experiment with this at a party we plan to attend tonight.
Thank you to all the advice, particularly from those who actually read my post
I don't have the 16-35L, and this would be a great lens for it. I don't have the cash for it at the moment.
RLPhoto - no idea why dance receptions are relevant to this...
LOALTD - I understand the Sigma 35mm f/1.4 is pretty good, but I have the 35L and so have no compelling reason to buy it. I keep reading about autofocus issues, even with the Sigma, and so went for the 35L instead and have been pretty happy with it. I was hoping for the 35L II but this seems like a fantasy.
TrumpetPower! - I do have the 40mm pancake but hadn't considered it - 2.8 is only one stop faster than f/4, and with the high ISO capabilities of the 5D3 I would choose the 24-105 f/4 over the 40 f/2.8. The reason to go for the primes in this environment would be to get substantially more aperture. I love the colour rendition of the 24L. I do take your point about it being more easily passed off as amateur though. My 40mm stays on my camera a lot of the time when I'm doing street photography as it is less conspicuous.
Sorry, I responded before my morning coffee!
Out of your collection, the 24-105 will be fine, especially if you are shooting with flash. I dont own a 5d3, but my 50D hunts like crazy in some scenarios without the faster lens or flash assist. Barring that, I think the flexibility for the unexpected will be pretty well suited with the zoom.
Lets see some of your work when you are done, and please check out the link I posted earlier. There is WAAY more info on that link that can help you out with tackling how to shoot in clubs.
Thank you actually, you gave me a push to go out and shoot tonight...