Sorry, Ray - I've printed 5D and 7D files, and the 7D files are better across the board, at any ISO.
No need to apologise. Such results could be truly remarkable. You should provide full details, including methodology. I'm sure DXO would be very interested to learn that their testing may not be relevant to real-world results.
DXOMark testing would indicate that only shadow noise at ISO 400 and below would appearto be slightly better in the 7D. In all other parameter, at all ISO's, the 5D has slightly better image quality.
However, it's understood that an 18mp sensor is capable of delivering slightly higher resolution than a 12.7mp sensor, but this is also dependent on choice of lens and aperture. If one is using an EF-S lens on the cropped format, the advantage of better edge and corner resolution may disappear.
If one is striving for a shallow DoF requiring use of the lens at its maximum aperture, the 5D will likely produce a shallower DoF. If the lens used on the 7D has a sufficiently wide aperture to match the shallow DoF of the 5D, the 7D's resolution advantage will likely be completely negated because lenses at maximum aperture tend to deliver poorer resolution. The significantly denser pixel pitch of the 7D requires use of
better lenses to deliver its potentially better resolution, not
worse lenses.
Nevertheless, the 7D clearly has more advanced features than the 5D. I admit it is quite possible that in any critical comparison of the two cameras, the advantage of the Live View feature on the 7D, allowing for more accurate focussing, could give the impression the 7D is producing images which are consistently sharper at the plane of focus. But this is more an issue of technique and methodology, rather than fundamental image quality.
Another factor to take into consideration is that F/stop multiplier of 1.6x, required for equal DoF on the 7D. This works out to around 1&1/3 stops, or 1&1/2 stops wider aperture for the 7D, but my own tests comparing the 50D with my 5D indicate that in practice it can be closer to a 2 stop difference for close subjects, such as portraiture. In other words, one might need to use a lens at F3.2 or even F2.8 with the 7D to get the same DoF that the 5D produces at F5.6, using different focal lengths of lens of course to achieve the same FoV.