...regarding Vaughn's comments on the 159mm f12.5 Wollensak - I think there was significant sample-to-sample variation in those lenses - I have one with the purple "WoCoated" mark on the front ring, and it covers 5x12 with perceptible but not objectionable sharpness loss at the corners stopped down to f22.
I think I got one of the lazy Wollensaks (with the "WoCoated" symbol, also)...it just does not want to do the heavy lifting.
But I do like an image I got from it:
Scanned 8x10 platinum print
At least with LF landscape, a bad day of photography can be a good day of exercise.