when i was shooting film, i've first had 2 copies of 58XL, the second was better... then i've bought a 55 tht i've found to be sharp but i didn't like the color rendition... it tends to blue !
Then i had the opportunity to test a 58XL selected by linhof, that one was a winner !
There are excellent copies of 58 XL around !
Then, i've found a good deal on a 55 digital... i've shoot two 4x5 and wasn't able to see a difference between this two... i was preparing the buy of a digital back, so i've sold the 58 for financial reason, and didn't have a chance to test it with the MFDB !
I've made a side by side comparison with a 80 XL and a 90 sironar digital (now named Digaron)
the 80 XL was quite good, but too contrasty for digital... problems with hight light !
So i sold it (it was a good lens for film, sharp and small).