Sanders has just about said it all.

My 10x8 Agfa Ansco came with a coated 12" Dagor, it was the best lens available in the late 30's when the camera was made. The seller said it wasn't worth using he'd fitted a 300mm f9 Nikon M instead. I tried the Dagor and found it to be an excellent lens, very sharp, wonderful tonality so despite already having a 300mm f9 Nikon M myself, and the camera coming with a board for it, I've continued using the Dagor in preference.

Good Dagors are quite sort after which is why they fetch high prices, particlarly the longer focal lengths and the late CP Goerz Am Opt, and Schneider Kern versions.