Django's admin is great. I think iommi is better for a lot of projects.

With admin, you basically just write models, and the entire rest of your app is free. Not quite, but, not far off.

Is there an equivalent of the Django admin panel in the PHP (Laravel/Symfony) world?

Filament, and it’s fucking awesome. I think it’s way better than Django’s admin panel, and I’ve used it to build out both my Laravel admin panel and basically all of the UI for users.