The focus is nice and quick

It is easy to handle and the lens barrel has nice grip on it for comfortable manual focus or zooming in and out

The focus is fast and accurate, you don't have to worry about filters (as in the case of the 14-24mm), it has VRII which is a strong plus for me, and is Nano coated.

Sharp, fast focusing, low noise, distortion is a bit high compared to other wide angels in the same range, but nothing that cannot be fixed in Lightroom

Does what it should and has great clarity and focus.

The manual focus isn't tight like ALL my other lenses.

it is very sharp and fast focus.

This lens is heavy, solid built, VR works great, focus is smooth and crisp.

Fast focusing, and improved performance with VR

One frustration is manual focusing for depth of field, I finally had to put permanent white dots on the focus ring for various distances as the lens is quite "touchy" and getting the proper hyper focal distance set is difficult.

It is a well-built pro-sumer lens; focus is silent, fast, and accurate

I'm almost always on a tripod and stopped down to f/5.6 or slower

The chief complaint with that lens - its slow f/5.6 max aperture at the long end - is moot in comparison to this lens, as they are equally fast or slow in the 16-35mm range.