Aye, maybe about the same level of competitiveness, now that you point it out? Between the war and Jock Stein's arrival as Celtic manager, Rangers won about half of the league titles on offer. As you say that's still a lot more competitive than nowadays. Even in the Fergie/ McLean era, Celtic still won about half the league titles available, and although Rangers weren't winning much, they were still competing well with the other three. They just weren't quite at the same level, but not far behind.