Certainly non-linear (in weight as well as price). Where you have roughly comparable lenses with, say, f4 max aperture (or a zoom with variable f4.5/5.6 or something like that) vs. an f2.8 fixed or zoom.
A good example is Canon 70-200mm.
EF 70-200mm f/4L USM is ~$600 and weighs 705 grams. (This is still a very good, fairly high-end lens.)
Compare to:
EF 70-200mm f2.8L IS III is ~$2100 and weighs over twice as much.
And certainly there are cheaper/lighter (and slower) third-party 70-200mm full-frame zooms and even smaller ones for APS-C sensors.
A good example is Canon 70-200mm.
EF 70-200mm f/4L USM is ~$600 and weighs 705 grams. (This is still a very good, fairly high-end lens.)
Compare to:
EF 70-200mm f2.8L IS III is ~$2100 and weighs over twice as much.
And certainly there are cheaper/lighter (and slower) third-party 70-200mm full-frame zooms and even smaller ones for APS-C sensors.