This means that you can make manual adjustments once the AF has finished, without changing to manual mode. has a silent focus motor built into the lens. Canon EF 35mm F/1.4L USM. Canon EF 35mm F1.4 II USM. Lenses with built-in focus motor focus faster and more quietly than lenses without a focus motor which rely on the camera's body focus motor. The new Canon EF 35mm f/1.4L II USM is very well corrected for distortion. Barrel distortion was mildly evident and easily corrected in Lightroom CC. In fact, I found the lens eminently suited to shooting architecture. I was pleasantly surprised to see that the lens held sharpness across the field wide open. The Canon 7D vs Nikon D300s In Shooting Concerts– The wide open aperture combined with great sharpness made the 35mm F/1.4 L a winner for concert shooting. Actually, it shot two concerts . The Sigma 35mm f1.4 is significantly larger than the Canon 35mm f2, and weighs quite a bit more too at 1.46lbs (twice the weight). This lens has more in common with the Canon 35mm f1.4 L II USM RwnZXv.