To the untrained eye, all black is black, I can grant you that. But additives and paint ingredient quality have a lot to do with the depth and richness of the color. If a painter knows what they're doing, they can make a black look lighter or deeper using other dots of color. If you're really serious about your black, it's worthwhile to research it a bit.
I've considered the SPI black for my black 85 442 repaint, eventually, and it's really black. I like it. It's also single stage. I like that too. Because it mimics how the lacquer was originally done on the car. Obviously it's not going back lacquer because I can't find anyone around here that wants anything to do with that. Any good painter anyway. It's ok, as if the SPI black single stage works out, it'll look like it was supposed to, I think.
I've considered the SPI black for my black 85 442 repaint, eventually, and it's really black. I like it. It's also single stage. I like that too. Because it mimics how the lacquer was originally done on the car. Obviously it's not going back lacquer because I can't find anyone around here that wants anything to do with that. Any good painter anyway. It's ok, as if the SPI black single stage works out, it'll look like it was supposed to, I think.