Opticallimits

Leica Super-Vario-Elmarit-SL 14-24 f/2.8 ASPH (aka Sigma 14-24mm f/2.8 DN ...)
https://leica-camera.com/en-AU/photography/lenses/sl/leica-super-vario-elmarit-sl-14-24-f28-asph-black-anodized-finish

Leica Super-APO-Summicron-SL 21 f/2 ASPH (the real thing)
https://leica-camera.com/en-AU/photography/lenses/sl/super-apo-summicron-sl-21-f2-asph

The real thing with the "real" price tag north of 5 grand.
I wonder if it's THAT much better than the Sigma 20mm f/2?