See my Canon mirrorless wishlist.
These examples establish the the night-shooting credentials of Canon RF 28-70mm f/2L at various apertures, but mostly at f/2. The results do not disappoint.
Includes images up to full camera resolution.
When and if Canon introduces IBIS, that and the f/2 aperture plus the 28-70mm zoom range should make for an outstanding walk-around street shooting kit for dusk and night, even if the ISO needs to be ramped up a bit for still darker conditions. In that event, maybe there will be nothing that can even compete, given the f/2 aperture and zoom range. Also, the weight itself of the Canon RF 28-70mm f/2L becomes a significant advantage for slow shutter speed shootingt, as it helps stabilize the camera via inertia.