Low light: 24-70mm IS 4.0 or 24-70 2.8

[Fernando Nicolas]

Shooting a music video on a 5D MKIII hat will take place mostly at night. All exteriors.

It'll be all handeld, with no rigs, as I'm stealing a bunch of locations.

It's going to take place in Manhattan, so there'll be sources of light around - from buildings, streetlamps, etc.

My question:

Should I rent the 24-70 IS 4.0, or trade in the IS for an extra stop and go for a 24-70 2.8.

I really want the movements to look fluid. So...

Thanks,

F.