Bromo,
I agree that in some respects that Mam 7 and Leica M have similarities, but even more differences.
My point was that despite being 'so close' they are also so very different directly and indirectly:
Directly - Mamiya 7 is double the weight and double the size as are the lenses, which are 2-3 stops slower and linked to a shutter speed half as fast as an M.
Indirectly - The weight affects how you carry your kit and its use (Access, spare bodies, film changes...). The leaf shutter means lens blinds need opening and closing. The list goes on.
Superficially similar (both RFs) but quite different in the detail and reality of use under certain circumstances. I dont want anyone to think I am suggesting that a Mamiya 7 is not suitable for street use or bad at it. Absolutely not, but this environment is where 35mm RFs are in their element which is why so many people use them for that purpose.
I could use either for street photography and be happy about it, but feel I am getting a better balance of characteristics with my Leica M. I own a RF645 and it is not the same shooting experience as a 35mm RF in the circumstances I described in previous posts and the RF645 is certainly closer to a 35mm RF than the Mamiya 7 (smaller, faster handling,fewer film changes).
I have no problem admitting that a Mamiya 7 is the 'better landscape tool' (By FAR). Why when the requirements are turned on their head does the mamiya 7 end up being 'like a Leica M but with bigger negs' in a street context? It just is not the case...the 'it's only a bit bigger, bit heavier, bit slower to use, bit slower lenses, bit slower shutter speed, bit more guzzly on film (bit bulkier) and bit more frequent changes, bit more of a problem with longer lenses all add up! Its the 'total package' that matters and that is that when added up these factors make quite a big difference IMO. If I was more working slowly and deliberately and not on my feet excessively (often in heat etc) and not shooting people and not taking 'reflex shots' or requiring narrow DOF I would drop the Leica and use my RF645 in a heartbeats....This is why I shot my spanish derelict house series on my RF645 as it allowed the fluidity and quality under more predictable circumstances. I did not have the Leica M then, but would not have used it even if I had.
Best to own both
