I have no idea why the comparison between the Concorde and the 747 was even made in the first place. The 2 jets were made for entirely different purposes.
The Airbus A380 would be a better comparison, since it has the same intended purpose as the 747 (massive amount of seating and cargo space for cheap flights)
Also, Boeing was working on it's own version of a luxury supersonic competitor to the Concord (the Boeing 2707 SST), but the project ended up being cancelled before it was ever mass produced (mostly due to to all the sonic-boom issues related to flying over land)
Comparing the 747 to the Concorde is like comparing a double-decker bus to a stretch-ferrari limousine