Image quality, vignetting, flare, and distortion test results, along with specs and standard product images, are now available on the Tamron 11-20mm F/2.8 Di III-A RXD Lens page.
This is the Tamron lens coming to the RF mount later this year. The full review is coming soon.
Here is a relevant comparison: Compared to the Sigma 10-18mm F2.8 DC DN Contemporary Lens
Support this site by ordering the Tamron 11-20mm F/2.8 Di III-A RXD Lens (or anything else) from B&H | Adorama | Amazon (all available countries) | WEX | Camera Canada
Rent the Tamron 11-20mm F/2.8 Di III-A RXD Lens from Lensrentals.