Just some comparison shots of the same scene in my office with different Nexus 7 cameras.
These thumbnails are all 20% the size of the full images and link to the full image.
Here is the comparison of the new and old Nexus 7 front cameras:
There is (obviously) no old back camera, but here is the new back camera:
For good measure, here's the same scene photographed with my Samsung Galaxy Camera at 16 megapixel resolution.
And I'll toss in screenshots of the new and old Nexus 7 screens:
