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\i think the widest aperture on the 100-400 is f4.
The answer might lie in a nifty fifty
The Canon 50mm f1.8 will give you a couple more stops.
On the 5D however you will be getting 50mm. If you have a 40D or perhaps an old 300D or 400D then you will also get the 1.6 crop factor which will give you a bit of telephoto.
Those extra two stops can make the difference between no shots and usable shots.
If you've got the money Canon also do an f1.4 and an f1.2 but they are lots more squids.
The 1.8 is about £60 - £80 and a remarkably fine lens for the price. Many Canon users have one somewhere in their bag. Good for music gigs and weddings when no flash is allowed.
Check out Tamron and Sigma they may have similar lenses.
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