Above is the Leica M5 with a 50mm next to a Sigma SD Quattro with 17-50 2.8 zoom. Probably a bit of an unfair comparison given the Sigma zoom, but in actuality the 30mm Sigma prime – which would be the functional equivalent on the Sigma of the 50 on a 35mm body – is about the same size.
The Sigma SD Quattro isn’t considered overly large for a high-end digital (it’s a really interesting camera too, incredible value for what is in effect medium format output) but it dwarfs the M5. The pictures really don’t give you a full sense of how much bigger it is than the M5.
I note all this because one recurring complaint about the M5, even today, is its size. I’m convinced most critics who complain of its size havent ever used one but are simply repeating what they’ve heard or read from someone else, that person typically having done the same.
My sense is that the original antipathy to the camera was borne of its look – certainly different from the iconic M profile – and most of the criticism justifying the antipathy was what logicians call special pleading (put an M5 next to a Nikon F2 for clarification).