The D300 won the group test, as Fen says, the percentages were based on their original reviews.
However, and this is especially the case with these cameras the reviewer has to take into consideration much more than pure image quality. The Canon 5D should certainly turn out better images, especially when viewed critically in the lab or at huge print sizes but that's not the whole story is it?, not for a lot of pro's anyway. How much good is a 5D to you when you need 6/8 fps for motorsport?, when you need a rough service dust and moisture resistant unit for a trip to Brazil?. If you find the ability to flick from one custom configuration to the other at the press of a single button (indoors to outdoors or portrait to action)to be a massive help to shooting in the field. The D300 not only lays the competitors cameras to rest but actually sees the end of Nikon's own D2xs and D2H, and at less than a grand that's a hard act to follow. But, if you do landscape and want the very widest, if you do portrait and wish to use natural light or studio work where the absolute ultimate in detail is required and you have the luxury of time and clement conditions then the 5D could well be the camera for you.