For about the same price as the EF 24-70mm f/4, you can buy a Tamron 24-70mm f/2.8 Di VC. The reviews I have seen place it between the original EF 24-70mm f/2.8L and the EF 24-70mm f/2.8L II in terms of sharpness. The Tamron, unlike both of the Canon 24-70mm f/2.8 versions, also has Vibration Compensation (VC) which is equivalent to Image
Rokinon RK12M-M 12mm F2.0 NCS CS Ultra Wide Angle Fixed Lens for Canon EF-M Mount Compact System Cameras (Black) 4.5 out of 5 stars 155 7 offers from $209.34
If you are looking for a high-quality wide angle lens for your Canon SLR camera, you might want to check out the Canon EF 35mm f/1.4L USM. This lens offers excellent performance, sharpness, and low-light capabilities. It is also compatible with full-frame and APS-C sensors. Find out more about this lens and its features on Amazon.com.
Still, in some tripod-based testing, the Canon EF 85mm f/1.4L IS USM Lens turned in nearly perfect f/1.4 results using the center AF point and not far from perfect when using peripheral points. Focus accuracy decreased modestly with more complicated subjects, but was still good overall. McmER3y.