Its all mega bullsheet.
Yesh, sure, I'm a Leica fanatic, I own all best. And when I pick up my Nikons I'm all "yeeeewwww". But my prints don't lie. I was amazed at the terrific character fromy negs. I mean WOW! I was like "so this is the Leica character they're talking about", ehile looking at a 20x24 print made from a 28-70mm f2.8 lens.
I'm still a Leica snob just because I'm weak minded and a victim. And my goal is to kill my Leica bodies. I confess. And the size.
But for character? It's all bullshiat.
You're in a very tiny, insignificant, minority with those views.
Lens designers make critical decisions when they choose the characteristics of their lenses, and they try to keep those characteristics similar across a range.
It's important to know what is meant by sharpness and definition. Geoffrey Crawley in a 1961 précis of his 1960-61 series of articles on developers clarified what he meant by sharpness, definition etc:
" Sharpness " - the overall impression of a print or projected image, measured scientifically as "acutance ", seen from normal viewing distance.
" Definition " - the extent to which fine detail is recognisably rendered in a print, etc. When acutance of fine detail is good, then definition is good.
" Acutance " - the contrast at the edge of significant detail, a scientific measurement of the density gradient at that point.
" Resolving Power " - the scientific measurement of the actual fineness of detail recordable by a lens, film, or developer, or any combination of these three.
So when Bill Burke uses the word
"signature" he's talking about the balance of the characteristics of a lens, of course choice of film and developer can have an effect when it comes to prints or slides..
If there weren't any differences in lenses characteristics, you could just buy the cheapest available and get the same quality results as the most expensive for any given focal length.
How much importance we as photographers put on the character or signature when we choose lenses is personal choice. I'm using Character/Signature as the sum of the individual characteristics.
Like Bill I've seen quite a difference in the lenses on my TLRs, a Yashinon, Opton Tessar, Xpres. and Xenotar overall stopped down they are all good sharp lenses, subtle differences in micro contrast and definition when printed, using the same film & developer, their character changes as you open up and shoot at wider apertures.
Ian