There is NO Light leak to the sensor nor does it affect exposure in real life.

Started Apr 7, 2012 | Discussions thread
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Many camera models are affected....
In reply to altenae, Apr 8, 2012

when you have an extremely sensitive metering system. It's not unique to the 5D3. And it's only with the lens cap on!!

Take the lens cap off and take some pictures!

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Canon EOS 5D Mark III Canon EF 20mm f/2.8 USM Canon EF 50mm f/1.4 USM Canon EF 50mm f/1.8 II Canon EF 17-40mm f/4.0L USM +5 more
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