When you’re just running out the door with your kids it’s hard to pick up the full frame behemoth.

I’ve been considering a m43 for that reason.

Yeah. I’ve got three kids.

I don't get the reference for the 11 pairs of shoes. I haven't handled new Nikon stuff (the last body I touched was a D80 a long time ago). But I doubt it's smaller and lighter than my olympus with a prime [0]. More power to you if you're OK carrying your kit, it means this works for you, which is absolutely great!

But, be that is it may, take a look around you. How many people do you see on any given day taking pictures with actual cameras, whatever the format? I live in Paris, a city flooded with tourists, whom you'd expect to be more likely to put up with carrying a somewhat inconvenient camera in exchange for better pictures. I can count on the fingers of one hand the people I've seen taking pictures with actual cameras in the last few months. And I walk or bike to/from work, along one of the most picturesque parts of the city. However, you can see people taking pictures with their phones all day, everyday.

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[0] Some of the bodies are actually surprisingly small. A sony A7C2 is "only" twice as thick as my Pen-F, the other dimensions being similar. But the body itself is useless without a lens. And while wide-angle offerings seem somewhat similar (though there's no equivalent to the 8-25/4), the tele end is much larger, even comparing a variable aperture to a fixed f/4 offering from Olympus. And primes are an absolute joke if size matters.