The 7D shot is less pixillated (1332x1218 vs 809x726) and there is slihgtly better resolution of the feathers on the back.
The 5DIII shot is also a bit underexposed, which isn't doing it any good. Indeed, the loss of IQ because of that underexposure is roughly comparable to the resolution gain of the 7D.
The two are close enough that I wouldn't make the decision of which camera to pick up based on raw resolution. Instead, I'd go with the 5DIII for its superior autofocus performance -- and, presumably, for the not-yet-real 7DII for its autofocus equal to the 5DIII but higher resolution and faster framerate. But I still might pick a 1DX instead of either, despite its lower pixel density, for its superior metering ability plus its even marginally better autofocus performance plus its absolutely insane framerate.