Is the canon rf 45mm f 1 2 stm good in low light?

Here is what the site says about that.

From Canon RF 45mm f/1.2 STM: Canon RF 45mm f/1.2 STM: A prime lens by Canon for Full frame cameras, 45mm f/1.2. Canon's first f/1.2 lens outside the L series, and light at about 350 g. Specs - Maker: Canon - Focal length: 45mm (prime) - Maximum aperture: f/1.2 - Made for: Full frame sensors - Mounts: Canon RF - Stabilised: no - Autofocus: yes What it frames like - On full frame (Canon RF): as marked, 45mm. - On APS-C ...

From Sensor sizes: Is full frame worth it?: For low light, events, and portraits with very shallow depth of field, yes. For travel, street, wildlife on a budget, and most hobby photography, a good APS-C camera with good lenses is enough, and you'll carry it more. Lenses and light matter more than the last stop of sensor performance.

Quoted from this site's pages.