Lees trains for Australian Bloodstock and said it was exciting to be getting the horse.
"What a dominant win. I've never seen a win like it," Lees said.
"I'm very happy for the blokes involved. They put a lot of work in, they're not afraid to back themselves and they got a result like that today."
Lees said Lucia Valentina didn't stay the 3200m after settling in the second half of the field.
"Kerrin McEvoy said she got caught in a lot of traffic when she needed to be going forward and that took some gas out of her," Lees said.
The Cup was not all good news with the death of the favourite Admire Rakti, who was travelling effortlessly before the home turn, soon after the event and seventh-placed Araldo, trained by Mike Moroney, was spooked on the way back to his barn and suffered a serious leg injury.