for the EPL, we can never be sure about whether or not we've won the title at this stage of the season. Last season, we were like this (what you're thinking right now) when we were 9 points ahead of City, and look how we ended up by thinking so naively. I'd say the title winner has yet to be decided, and a 12 point lead means nothing to me. Not sure about the La Liga though.
So the English, German and Spanish league are already over pretty much. Bayern Munich sit 15 points ahead of Borussia Dortmund, Barcelona are 12 ahead of Atletico Madrid and Manchester United are also 12 ahead of City. So much for La Liga being boring due to only one or two teams having a shot of winning. These three leagues were pretty much over half way through. Will this be a pattern that gets repeated from now on? Because I really hope not. I understand these three teams have been outstanding in their respective leagues but the other teams need to step it up... City, Real, Valencia, Arsenal and Dortmond have been lack luster in the league.