The Liverpool/City game is obviously going to be very important but it's worth noting that Chelsea have the best big-game league form this season. Amongst games involving the top four teams (ie 6 matches for each team).
Arsenal have obviously been crap (we beat Liverpool 2-0 at home, home draws with Chelsea and City but then big away losses to all three). 1-2-3 with an awful goal difference.
City have beaten Arsenal and Liverpool at home, but they drew with Arsenal away and have lost both times to Chelsea. 2-1-2 so far.
Liverpool have beaten Arsenal at home, but then lost to Chelsea, City and Arsenal away for a 1-0-3.
In comparison, Chelsea have smashed it. They've won both times against City, once at home to Liverpool, once at home to Arsenal and drew away with Arsenal for a 4-1-0.
It mystifies me how Chelsea have not run away with it with that sort of big-game performance but clearly they've had more surprise losses to the lesser teams. I think it also tells Liverpool that Chelsea is the much more dangerous fixture. And if Liverpool want to win the league they'll need to improve on that 1-0-3 record, although admittedly most of those games were away.