You can buy a 5 holesaw that will cut a perfect circle but will leave burrs that need to be removed.
How to cut a perfect circle in sheet metal.
That link shows an adjustable circle hole cutter but does not appear to be used on metal.
We had a need to cut a 7 circle out of metal on a sunday and didn t have access to any stores that sell them so we made one.
The speed and orientation of cutting with laser tools are limited within 2d.
When there is will there is a way somewhere between brute force and finesse i used a terratek multipurpose oscillating tool to cut out a 12 inch diameter h.
A punch can be very expensive.
In response to a question about h.
It didn t work as well as plan.
The best way to make perfect clean holes is to use a punch.