Ruined said:
No one took the challenge because it is meaningless. It is like trying to compare two sets of speakers using entirely different songs. You could mix in the Otus, Noctilux, and nifty fifty and get great pictures all around as like I said earlier diminishing returns are there. Without the same scene and lighting comparing lenses is pointless as you don't know how much more appealing it could have looked.
side by side the differences are there as outlined above; whether you appreciate them or not is a different story.
That is misdirection of the worst sort. There are so many claims the lens has a "unique", "special", "distinct" look that those distinctions should be readily apparent in images, but clearly they are not. We don't shoot images with two same focal length lenses then ask the client which they prefer, we shoot what are hopefully compelling images with the lenses we have. That a particular image might have had fractionally different oof blur, less dof etc if it were shot with another lens is moot if you can't tell which was used anyway. Compelling images with minimal dof and very smooth oof blur can be shot with three of the Canon 50's and the Sigma's. Digital post processing clouds old film lens characteristics like contrast and colour such that they are irrelevant too, add in this weeks favourite post process and the differences become undetectable even by "experts".
As I have consistently said, there are good reasons for choosing one lens over another, even the 1.2L, but lets stop the bull about unique look when nobody can actually back it up.