Are you sure he wasn't a pretend full framer with an aps-c dslr body? The cheek of it.
The most ostentious full framers are not those with dslr bodies but those with a Sony A7 body as getting used to the controls is sure to put an impressively serious furrow in their brows. They know that you know they have a FF engine inside. No need for big lenses, they are sure to have Voigtlander, Ziess or Leica written on the front.
Just like the guy with a hot cam and a lumpy exhaust that pulls up alongside at the lights. Pity the choke lever has gone otherwise you could easily have your own lumpy exhaust note at the flick of a lever and tease a bit. Leaving him disappear over the horizon in a cloud of smoke and burning rubber .... smugly satisfied I suppose.
Myself I just put huge lenses on a GM1 - impress people? Just like any other clown I think
--
Tom Caldwell