That picture is from a very famous movie (guess which one) and I have no idea which lens was used
Just meant to illustrate. It would look similar taken from 1.4m, not 2.5 with a 180mm. So: Zeiss, not Leica.
And from about 4m a 180 on S-35 would give you the head including the shoulders, not more. I told you it's a very long lens for film. The 135mm f2.8 Zeiss C/Y is a very good lens too, but suffers from the same difficulty: no space for a support. In that case, you may get away without one if the adapter is good.
May I please ask you a more basic question, since you are now switching the discussion to Leica-R?
What are you looking for? Vintage lenses in particular, or specific focal lengths? Primes or zooms?
Please forgive me, but I'm not sure if you start this investment with the necessary knowledge. There are excellent modern lenses too, like Sigma Art line, or even some cheap ones from China with decent quality.
Anyway, I'm not familiar with Leica lenses, I'm a Zeiss and Minolta guy. Over at Reduser is a Leica-R thread with lots of information and pictures:
http://www.reduser.net/forum/showthread ... D-Pictures They tend to be more expensive second-hand than Zeiss C/Y, but quality is in the same league.