The Saturn V could get a lot of mass to LEO but most of that mass was fuel to get from LEO to the surface of the Moon. A design caveat of SpaceX Starship (a des

The Saturn V could get a lot of mass to LEO but most of that mass was fuel to get from LEO to the surface of the Moon. A design caveat of SpaceX Starship (a design feature that's yet to be demonstrated/proven) is refueling in LEO. So the Starship gets a bunch of payload mass to LEO, refuels, and then heads to the Moon. For Mars it would need to refuel on Mars to get back to Earth. It's the refueling that potentially gets a huge usable payload to the Moon. A second Starship whose only payload is fuel would launch with the first and they'd rendezvous and transfer fuel. Ostensibly if something went wrong with the refuel rendezvous the payload (or personnel) carrier would still be able to abort back to Earth.