Definitely not!

The top tier automotive paint from any of the top companies (PPG, DuPont, Sherwin-Williams, Sikkens, RM ...) is expensive because;
1) Color Match research and documentation
2) Lifetime Warranty (which applies when a certified body shop does the paint)
3) Meeting OEM specs

The paint that's the next tier down? It was the top tier paint last year or a couple of years ago. It had to meet OEM specs then (chip resistance, UV resistance, etc.). It didn't get worse just because they came out with something newer. However, they typically don't offer alternates on that line - you get the standard mix for that code, and no other choices.

If anyone is curious where I am getting all this from, I worked for an automotive paint manufacturer (one of the top 3) for many years.

The other thing is - no one makes all their own stuff. The paint companies sell stuff to each other, or there are third party vendors who manufacture some of these products and label them for each paint companies - especially pearls, hardeners and other additives. SO ... any talk about any one brand being better than another is pretty much BS.