The autofocus on the f1.4 is very fast, the f2 version is faster but not enough to make a huge difference

Lighter, smaller lens hood, smaller diameter, faster autofocus, less noisy

The extremely small size and weight, very fast autofocus, and weather resistant design make this a great lifestyle and travel lens.

It doesn't let in as much light or produce as much bokeh as its 23mm f/1.4 counterpart, but it makes up for it with faster autofocus, smaller size and weight, and rugged build quality.

Autofocus is totally silent

Fast autofocus

n’t think i’d miss it that much