It's not really about who has the best car, we already knew it would be Mercedes, it's how far the others have caught up, and where they've caught it up. Williams were a threat at a few tracks, but poor decision making has cost them victories, Red-bull had the chassis but not the engine and I expect them to be a threat later in the season, they've always done well later in the season, where the traclks seem to favour them more, and by then TAG will probably have improved the Renaults engine, I can see them winning races later on. And then there's Ferrari, how much time do they have to make up to be enough of a threat to snatch victories?
I think the Merc will be the best or 2nd best at all the tracks, but don't think it will be the best at anywhere near as many as it was. There's also the bad blood, I hope Lewis does something a little naughty in Aus that pisses Nico off and gives him some early season anger to fight.