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I can tell you in GT5 the video game that when I was driving and switched to looking out the back window that the view is restricted. But like other people said, the backup camera should fix any problems you have. To be honest it was a design compromise.
The back window looks larger than the one in your avatar
If you're talking about the square-footage of glass, yes, you're likely correct. The C7 definitely appears to have a larger rear window than a C5 Z06.
However, I think the OP was referring to visibility via the perspective of the rear-view mirror. The C7's hatch seems cavernous and somewhat restricted on each side by the c-pillars.
Here's the only 360-view I could find of the interior.
The rear window seems similar to my CTS coupe, which I thought was going to be an issue. Once I've gotten used to it, however, especially with the blind spot indicators on the mirrors, I find it to be q
quite easy to drive confidently. The backup camera supplements what you can't see looking out the back, so it should be covered. (not sure what happened during my post-I didn't hit send-some sort of power surge or something)