I would agree about the ultron lens, but they are very few and far between, if you can find one grab it, but there were far more of the Skopar lens, and it is certainly np slouch in terms of performance, although a tessar type lens it performs better than the Tessar, I have several Voightlanders with the Skopar, but none yet with the 6 element ultron, but you never know, maybe one day.
Richard