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Well-known
Leica M2, Weston Master V in inside pocket, plastic bag to put the camera in when coming inside (condensation). -40 C no problem. Watch out for metal sticking to skin.
Other factor to consider when shooting in cold weather is condensation on the inner lens surface. It's been my experience when the camera is brought back into a warm building from a day of cold weather shooting, the lens surface could condense and leave watermark...
It's me again. I shot both with the MP and M7 in winter. One advantage the M7 has over the MP: the shutter speed dial is far easier to manipulate with gloved on. Single-digit rotating with gloves on was no problem on the M7, awkward at best on the MP.
Immerse the camera in the cold so completely that it gets cold through and through. Don't want to do that, lest you get condensation on the inside when you go back indoors.
it is well known M7 shut down in clement weather. Here, your best bet is the MP or M6.