>>3777318The low light performance can be worked around.
Olympus cameras have a Livecomp setting in Manual mode that means that if it's mounted on a tripod, you can set it to perform multiple exposures, giving you good ISO. Though I must admit that this takes time.
With a fast lens, something like f0.95 then you can take faster shots overall, and avoid higher ISOs.
Plus, if we're assuming you're shooting in RAW, post processing software has some really damn good noise filtering.
Would a full frame camera perform better at night? Yes. Would a full frame camera cost more and weigh more? Yes.
Personally, I don't mind and limitations of MFT. If I really want night photography, I just take out my film camera loaded with Kodak TMax.
I can post some night photo examples.