Originally posted by jsherman999 One interesting thing I've heard repeated and have witnessed myself is the 'punchiness' of the DA limiteds - more contrast, maybe brighter colors, more of a 'modern' digital look. I think this may have something to do with the angle of light delivery to the sensor and possibly updated coatings, but I don't think I've seen a definitive answer to why this is.
It could be, there was a posting somewhere also about the need of some F and FA lenses of a hood, as a hood reduces stray light that can cause loss of contrast.
Also, and I forgot about this in the discussion about lens differences, is the move to internal focus, as opposed to moving the entire group, and also when aprochromatic lens designs began. I am not sure where these points fit in the overall equation / evolutionary map. Some of these could also impact the "punchiness" of the image.
it might be worth a test. same shot every 50mm lens (for example)