Excuse me. What race were you watching? I posted this in the Ferrari thread yesterday and after his pit stops Vettel was pushing and Massa could quite comfortably match his pace.
Actually looking the times when the Red Bulls bothered to push for some laps during the race, the difference is like that, if not more.
Have a look at Massa's pace after the first pit stop prior to running into a slow Hamilton and then after he got by on lap 21. Furthermore Alonso's fastest lap set in the final stint was a match for Vettel's although set 3 laps earlier while Massa's was 2 tenths faster set earlier in the stint. Vettel was also pushing after his second stop in order to extend his lead over Webber which had shrunk to 5 seconds by that time but Massa was held back by Ferrari so he maintained the gap to Alonso at 1.5 seconds.
There is no evidence whatsoever that Red Bull were significantly faster than Ferrari in Korea. Maybe they were that much faster than Alonso but not Massa.