What are you shooting with, and what are you shooting?
The 24-105 is a great all round video lens, but if your work requires you to go longer, the 70-300L could be a good option (70-300L is word of mouth; I'm yet to use it).
If it was me, I'd grab the 24-105, and like another poster suggested, the Rokinon (Samyang) 14 f 2.8 for super crazy wide landscape scenes.
Just my $.02,
Thomas.