I am talking about the quality of wide-angle lenses, not their sizes. The Z mirrorless wide lenses are clearly superior to the F-mount wides in general. An easy example is the 14-30mm/f4 S that can accept regular 82mm filters. All F-mount 14mm wides have a bulging front element. A few days ago I compared the Nikon 35mm/f1.8 S (Z mount) against the much praised Sigma 35mm/f1.4 Art in the F mount. The Z 35mm is even better and is of course much lighter than those heavy Sigma Art lenses. Compare the F mount and Z mount 14-24mm/f2.8 Nikkor lenses. The Z one is one full pound lighter and can accept 112mm screw-on filters. Of course quality is better. The Z lens is not necessarily more expensive either. The F-mount 14-24 is cheap now since the F mount is now out of favor so that a lot of them are on fire sale and are getting discontinued. The Nikon S line mirrorless lenses are intended to provide high quality, not small size. They are certainly not cheap. There are two up-coming 40mm and 28mm Z lenses that are small, and they will probably be cheap too, but I expect quality will have some compromises.