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I’ll take a pic of my GM1 to demonstrate the size. I had a GM5 as well, but didn’t really use the viewfinder (though wish the GM1 had a thumb scroll)
I have one of those Garmin edge elastic lanyards on it for security.Id have 16 megapixels in a larger sensor compared to 20 megapixels in a smaller one, especially as a lot of the detail and image quality will come from the lens.
You can pick up a GM1 with 12-32 lens for £200 or something these days, and if you supplement with a £100 or so pancake lens. (20mm f1.7 or 14mm 2.5)
https://www.dpreview.com/reviews/panasonic-lumix-dmc-gm5
RX-100 has higher MP but smaller sensor - more noise but better detail when cropping?
But those lumix are physically smaller.