I scower the internet for "weather-test benchmarking", but alas…

For me the weather sealing of cameras has been a determining factor in camera choice for the last 20 years – and in these years I’ve never been let down by the Olympus/OM cameras.

You have already gotten some good advise above.
If you’re specially focused on large aperture lenses, though, I would just comment that I’ve always found the 1.2 lenses in the m43 system to be too large and cumbersome to be attractive. However, the (relative) newcomer 20/1.4 is in a different league, and its field of view could possibly be an alternative for your street photography.