[Leica] Elmarit 28mm (used) or Zeiss 28mm for M?

[rangefinder at screengang.com (Didier Ludwig)]

Chris
Cannot agree about used lenses not being satisfying. Seven of my ten 
Leica-compatible lenses have been bought used; and I had no problem except 
with one that had a stiff ring and focused over infinity - and that was a 
new one. The others are all fully satisfying for me.
Didier

>After a few years of buying and using used Leica lenses my advice has 
>become:
>Buy new whenever possible (the extra cost in each case has been worth 
>while in the long run) Don't buy used unless you have an evaluation period 
>(which includes running a few rolls and/or sending it to Sherry even if it 
>"looks" good. Only buy used from original owners or experts like Sherry. 
>So the brand isn't necessarily the most important issue regarding 
>quality.  And A satisfying lens is priceless.
>
>Chris