Less distortion.In the sense that it is possible to take an optical formula and change it so it would, say, have more distortion?
For the cost of weight, price, corner resolution and vignetting.
Basically, the manufacturer does "analog" correction inside the lens instead of "digital" correction in camera or computer.
First of all, it's the RF 14-, not RF 16-. Second, it has the MFD of 20 cm. Third, it has fast video-friendly autofocus...The RF 14-35mm f/4L is $600, or >50%, more expensive than the EF 16-35mm f/4L. Making it slightly smaller & lighter (78 grams, like three packs of cigarettes) doesn't sound like good news for Canon's bottom line.