Hard to top this.
I worked in the Cadillac Design Studio for a few years and we still talked about this car as an example of what could be done when you unite the organization to develop a true halo vehicle and empower the team to do whatever it takes to make it the best in the world. That's getting harder to do these days, but still possible with the right leadership.
Link to 1958 Eldorado Brougham auction