As of mid-2015, there’s no better lens testing platform than the EOS 5DS R. Just published, both on the 50MP Canon camera:
- Sigma 24-35mm f/2 DG HSM Art sample photos at DPReview here. 45 full-size shots, most wide open.
- Sigma 24mm f/1.4 DG HSM Art review at Photozone here. Excellent sharpness in central areas, but the lens struggles elsewhere at wide apertures, which is not terribly surprising. At least the performance is assessed in the proper context.
While the Sigma 24mm f/1.4 DG HSM | A is certainly not a bad lens, it is still the weakest prime of the Art series that we have tested so far. To be fair – an ultra-large aperture 24mm lens is simply more difficult to design than a 35mm or 50mm lens. This also applies to the Canon EF 24mm f/1.4 USM L II. While we have tested the Canon on 20mp only so far, it already struggled with the image corners at large apertures here so it’s very unlikely to be better on the EOS 5Ds R. Thus if you struggle to decide between the two, we’d actually recommend to have a closer look at the Sigma.