Indeed. The point gap between Real Madrid and Sevilla isn't so significant. If Sevilla can beat Valencia in the upcoming match, the point gap will be 2 points only. In theory, Sevilla and Real Madrid have the same chance to win the title this season. But if considering the players' quality, I prefer to choose Real Madrid as the favorite candidate. That's exactly what I mean in the previous post. However, it is only my personal viewpoint, it can be a bit subjective. 
In reality, sometimes a better squad quality can be defeated by a team that has a more solid squad.
In reality, sometimes a better squad quality can be defeated by a team that has a more solid squad. From the point of view of the bookmakers, the teams now have the following chances for the championship:
Real Madrid 1.12
Sevilla 6.85
I think it's hard not to notice that they're far from equal. Despite the fact that Real Madrid is busy in the Champions League and will certainly spend a lot of energy there (I hope to reach the final), Sevilla simply have fewer resources to keep the fight going until the end of the championship.