Is it though? It has been beaten a couple of times this year, and Max is having to work for a living to win his races. I don't rate Perez, but I suspect that in that hands of most better-than-Perez drivers on the grid, the #1 Red Bull would not have had so many wins this year. I saw a comment the other day that other team principles think that Max brings 2-3 tenths to the car. Take that away and you would have very different standings.
It's still a very good car, but I'm not sure that if not in Max's hands, it is the best.