EF 16-35 2.8L II vs EF 17-40L 1.4 on 7D for video

Here's a question.

I own a 16-35 2.8L II and I'm really happy with it.
But today I found a used 17-40L 1.4 for a good price, so I'm thinking of maybe getting it and have both.
For one thing, the price makes it a good deal, but also I'm shooting a lot of exteriors with no extra lighting so the light sensitivity is also part of it.

How do these two lenses differ? Would I benefit from owning both? If so, how?

EDIT:
Duh. Nevermind. I haven't had my coffee yet. It's 1:4, not 1.4
Move along, there's nothing here to see.
 
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