Sorry, no Potenza experience to share -- using Chorus at the moment.
But curious where you found Campy indicating Potenza was an Ultegra competitor?
For a double crank, Potenza and 105 represent the lowest cost 11-speed groupset from the respective brands. Otherwise, equating one brand to the other though might be by groupset weight, though I don't know what these are. I really like the Potenza Silver look fwiw.. did you do black or silver?