Zlatan Ibrahimovic fired the hosts into a first-half lead before Rio Mavuba levelled on the stroke of half-time for Rene Girard's men. Salomon Kalou then put Lille in front from the penalty spot shortly after the break but a Marko Basa own goal handed PSG a valuable point.
Blanc's men head into the winter break with a three-point lead over Monaco at the top of the table, with Lille a further point back in third. Yet the PSG coach was disappointed with the draw on home soil.
"My feelings are mixed," he told L'Equipe. "I regret the result but at least have the satisfaction of coming from behind to score. My biggest regret is not going into the break with an advantage. I do not have much to criticise my team about in the first half. [Lille's equaliser] was simply a mistake.
"I nevertheless enjoyed the game. It was intense. I am disappointed with the result but Lille played their game well. Still, looking at the statistics, PSG did not deserve to lose this match. What makes me happy is that, tired or not, we gave a lot of ourselves until the very end. Lille are a difficult team to play, very aggressive."
Blanc has now been at the helm of the defending champions for six months, taking over from Carlo Ancelotti, and admits overall he is happy with the progress the players have made during that time. "I can say this has been a positive spell," he said. "To have 44 points at this stage of the season is not bad.
"What I am particularly satisfied with is that we can score a lot. We get goals because we take risks. And I think people take pleasure from watching us play."