There is a MASSIVE collection called the KAQ collection, they're not One:1 customers but they have 2 Ageras (1 R, one regular), multiple Veyrons, at least 2 of them Supersports, at least 1 P1 and I would honestly be surprised if they didnt get atleast 1 918 and 1 LaFerrari. I think they own multiple Paganis aswell including the first full carbon Huayra, they have atleast 1 Gumpert and multiple One-77s, probally a whole lot of other goodiss aswell. The collection is spread across the world, some are stored in Geneva like the Ageras and a bunch of Veryons, some are in Abu Dhabi and probally some more in other places.
As of the One:1s, #1-4 are going to China, #5 UK and #6 USA, previously #6 was going to Germany. The pre-production car has also been sold to a UK customer.
The person who was supposed to get #6 in Germany is a racing driver with a pretty sweet collection, Vitesse, 918 weissach, Gumpert, Carrera GT Awe, 599 GTO, Koenigsegg CCR and a CCXR wich he is currently selling. He drives the crap out of his cars unlike the ones in the KAQ collection that has no mileage to speak of.