[Leica] M6 It's a good camera. Good. But great? No. It?s true or not?

["sam" <salex@idt.net>]

Austin Franklin wrote, in part:

 <<<Even the Biogon lense that was developed in the early 50's, has not
had ANY optical formula improvements since then.  It is claimed, even today
with all the computing power the world now has, to be 'perfect'.>>>

Wasn't the glass used for this lens changed after it's introduction?.
I recall someone saying they stopped making the original glass and the
subsequent glass was not as good. Anyone know more?

s.a.