Not entirely. Currently, yes. I loaded it up for my future projects/photography. What's disappointing is that it doesn't meet expectations when doing something simple such as browsing.
What a joke, Safari displaying that kind of message simply underlines the fact that the website uses a lot of memory...I sometimes get the same message on Facebook with my 16GB RAM MBP.
Anyway, I really doubt the problem is the computer in itself, it could simply be what is between the keyboard and the chair. Lots of professional are relying on the 16" MBP to run their business and it is a wonderful machine in that regard...