Of course Manchester City is not alone in challenging for the Premier League title this season. Liverpool, Arsenal and Tottenham are also on the same path as Manchester City although I fully believe that Manchester City have the best chance of securing it. I found them leading the standings, so normally it would be difficult for another team to knock them out of the top spot.
City are at the summit of the table, but they lead by only one point, and another team can take top spot in the next few weeks. Being on top of the table now is great, but there are still so many games to play and quite a lot of things can happen, i expect the team on the summit of the table to change quite a few times before the end of the season.
City are very consistent when we get to the crucial part of the season, that's the time that if they go top, it is almost impossible to take the lead from them, and that's because they go on long winning runs. I also expect City to win the title, but do not expect them to top the league from now until the end.