Image quality results from the Canon EOS 5Ds R have been added to the Sigma 14mm f/1.8 DG HSM Art Lens page.
I had high expectations for this lens, and it indeed appears to be an optically-great one. I was viewing lots of comparisons and thought I'd share many of them.
Sigma 14mm f/1.8 Art compared to Canon 11-24mm f/4L Lens
Sigma 14mm f/1.8 Art compared to Canon 14mm f/2.8L II Lens
Sigma 14mm f/1.8 Art compared to Canon 16-35mm f/2.8L III Lens
Sigma 14mm f/1.8 Art compared to Irix 15mm f/2.4 Lens
Sigma 14mm f/1.8 Art compared to Rokinon SP 14mm f/2.4 Lens
Sigma 14mm f/1.8 Art compared to Samyang f/2.8 Lens
Sigma 14mm f/1.8 Art compared to Sigma 12-24mm f/4 Art Lens
Sigma 14mm f/1.8 Art compared to Sigma 20mm f/1.4 Art Lens
Sigma 14mm f/1.8 Art compared to Sony FE 16-35mm f/4 Lens (different cameras)
Sigma 14mm f/1.8 Art compared to Tamron 15-30mm f/2.8 VC Lens (different cameras)
Sigma 14mm f/1.8 Art compared to Tokina 16-28mm f/2.8 Lens (different cameras)
Sigma 14mm f/1.8 Art compared to Zeiss 15mm f/2.8 Classic Lens
The Sigma has a moderately high price tag, but these results show that you get (at least) what you pay for.
The Sigma 14mm f/1.8 DG HSM Art Lens is in stock at B&H | Amazon | Adorama.