Barca holds a 15-point advantage over the champion in La Liga, but Karanka was delighted with how his side competed - even without the likes of
He said: "The real difference between the teams you see when we play. It is quite competitive.
"It was a great effort from all of the team because there were a number of players out of position.
"There will be time to prepare for the second leg, but the team are more than good enough."
Raphael Varane was Madrid's hero, heading home
Karanka was full of praise for the young Frenchman, who also cleared a goalbound shot from Xavi off the line in the first half and produced a perfectly timed last-ditch tackle to prevent Fabregas adding a second when the score was 1-0.
"It is not possible to have done better than Rafa did," Karanka said. "He cleared one off the line and scored the equaliser.
"Following his progression has been phenomenal because he also had his head in the right place. With the team we have started with, everyone has done very well and we are happy with the match."
Varane himself described the experience as a 'dream' and believes all is to play for in the return leg
He told AS: "It is a match I will always remember. It is a dream at 19 years of age.
"I am happy with my performance and that of the team. Now we need to continue like this. Mourinho told me to give everything that I had and at the end my team-mates congratulated me. It is not the best result, but it leaves the tie open."
Barcelona stand-in coach
He said: "I don't want to speak about punishment. Our lesson is that a draw at the Bernabeu is always a good result.
"For us it is a good result but nothing clear. In the second leg we will go out to win because in the first leg we have done the same.
"I said before that these games are very difficult and are resolved by very fine details. The tie will be decided in
Roura insisted the Catalan side was not surprised by the host's high-tempo start to the game, and felt Barca adjusted well after a shaky opening.
"The media were saying that Madrid had a lot of players missing, but Madrid haven't been weak and we knew they wouldn't be," he added. "We knew Madrid are a strong and physical team and that they control the opening minutes more often than not.
"At the beginning, we had problems but after that I think we had control of the game - or as much as you can control against Madrid."