the slower lenses are often superb, even the old ones! FWIW, I find that my 80 f4 rodagon is one of the less brilliant enlarger lenses I own. Its fine, but bettered by the 105 5.6 I have and my 65mm lenses. Its sharp, but never quite brings out that perfectly etched grain that some of the others produce. You never notice on its own, but if you print the same neg with the 80 and 105 the one off the 105 has a bit more sparkle and very fine detail. Why not try the 80 5.6 and see how it performs? It could turn out to be dynamite.