The Carpathians I planted at my former property are quite large and I think they are producing quite a few nuts. Mine have been very slow growing. I think the hardpan and wet conditions are not favorable but my other yard was wet too. I did get some nuts last fall from a large tree I bought from Nolin River Nut Nursery and they were large and excellent. As good as California walnuts. Easy to shell.
The pawpaws took quite a while to bear fruit. I probably planted them 5-6 years ago. I would have to dig for the receipts to be sure. They are still quite small- maybe 7-8 feet but I don't think they get very large. We enjoyed our first pawpaws last year and that was the first time I ever had them. We all loved them. It is like some exotic tropical fruit that I would expect in Asia. Like custard.