Is the 2006 grid the best ever in terms of manufactures engagement?

Ferrari aside, you basically had other 5 factory teams from some of the most important OEMs in the world ( Renault, BMW sauber, Toyota, Honda, Mclaren-Mercedes), and a legendary name in motorsport like Cosworth as well. I don't think we will ever see a lineup like this again in the near future, at least with official factory teams, even though I'm excited for Audi/Redbull-Ford/ Aston Martin-Honda next year (rip Reanult)