The original 3 Generations can be found here.
↑Leica M9 and Leica 35mm Summilux FLE @ f/1.4.

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Hello Peter,
So many questions! I’ll be concise, but hopefully comprehensive, in my responses.
In a nutshell, given you already have a D700, I would recommend:
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(*i.e. one lens. I wouldn’t bother with any other for now. And really, it will free you.)
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I should also inform you that I am biased towards CCD sensor-based cameras, even though the new “M” will have many features, the “older” technology wins out for me at base ISO (at least until I’ve seen evidence to the contrary).
Your question about the 35 Summilux vs. 35 Summarit: Both are capable, but the 35 Summilux is the optically “superior” lens (sharpness, micro-contrast, etc), however it tends to “paint” with bold strokes which is desirable for some subject matter but may be too harsh for others. The 35 Summarit, on the other hand, is a little more classic/delicate in its rendering with a smoother bokeh. It’s a lovely little lens. You may view examples from both the 35 Summarit and 35 Summilux on my site:
http://prosophos.com/category/leica-35mm-summarit-f2-5/
http://prosophos.com/category/leica-35mm-summilux-asph-fle-f1-4/
Ultimately, which you prefer is really a matter of personal taste, but if you opt for an M9 (vs. the new M), you really should purchase a Summilux lens for low light work. Also, the Summilux (50 or 35) lenses are something special and need to be experienced at least once in a lifetime.
As for your question regarding whether the low ISO constraints of the M9 limit creativity, I’ll let my images speak for themselves. I don’t mean this in an arrogant way, but as a practical answer.
Finally, I shoot in DNG (RAW) format and am able to make minor colour adjustments easily during post-processing, so I do not have any issues with “skin tones”.
I hope this helps, and I thank you for your very kind comments regarding my work. Despite my answer above, I really do think the new M will be a terrific camera, so I believe you can’t go wrong either way.
Respectfully,
Peter.
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