I have an example to add. Picture is shot with 50mm APO ASPH Summicron lens.
You can tell each leaf apart, each branch apart, every single color and contrast falloff, every single different transition in color, even in the out of focus areas that are blurred to hell. It's not rendered flat like on most other lenses where you have to strain your eyes just to be able to tell one leaf apart from another or which leaf is from which branch or similar... 3D rendering of depth and tones and I agree, I don't use Sigma or Tamron lenses but from what I've seen on the internet, even the
>>4086420 and
>>4086419, both show images rendered very, very, very flat and messy with no depth, no micro contrast, no nothing.