Well, I wouldn’t call the 50 1.8 or the 24-70 f4 heavier. Those are the two I have. Now anything heavier than either of those, I want no part of because for me the whole point of this exercise was to lose the weight of the F system.
Nikkor 50mm f/1.8 AF-S, 185g, $220
Nikkor 50mm f/1.4 AF-S, 280g, $450
Nikkor 50mm f/1.8 S, 415g, $600
Nikkor 85mm f/1.8 AF-S, 350g, $480
Nikkor 85mm f/1.4 AF-S, 600g, $1,600
Nikkor 85mm f/1.8 S, 470g, $800
The 24-70mm f/4 doesn't have an F-mount equivalent, but it's 500g vs. the much longer reaching 24-120mm f/4 at 710g. They both cost around a thousand dollars.
I don't doubt for a second that the Z-mount lenses are better than the F-mount equivalents, but who will see the difference other than photographers? What will make a difference is that additional, lightweight F-mount lens that I can afford to buy because I didn't spend my money on expensive mirrorless lenses.