Congrats on your new car!
Honestly, the numbers are relative. Every car that has been reviewed has been tested in the right conditions, altitude, and etc. Carlos Lago talks about this quite in depth, its something you should
watch on this link right here.
In my experience, I'd be lucky to hit a sub-5 zero to sixty pull. The longer you own your car, you eventually go past the point where you ask, "why does the number matter?" Honestly, go have fun with your car man. Don't worry if that Mustang has more HP, the only technical specification you should worry is about 'Smiles per Miles'.