I don't mean to criticize the lens - by saying it is soft at the edges, it's not a Petzval. There is just a very slight softening and distortion at the periphery. You can look in my gallery uploads, most everything that is 4x5 was taken using that lens. You might be able to see what I mean.
It's funny that when I used a community darkroom, I enjoyed a Nikon enlarging lens, so when I went on my own I selected one to buy brand new. It never met my expectations. But a Rodenstock Omegaron, which was a good bargain, proved to be my first usefully sharp 50mm enlarging lens.