In the behind the scenes video of Her, Spike Jonze can be seen wearing and using his Leica M, keeping it high and tight. And in one shot, he meters off of his hand.

He has been seen with an M6 before. Unsure if this is the same.

Spike Jonze on the set of Her with what is likely an M6

Spike Jonze on the set of Her with what is likely an M6

Spike Jonze on the set of Her with what is likely an M6

Spike Jonze on the set of Her with what is likely an M6

Spike Jonze on the set of Her with what is likely an M6

Spike Jonze on the set of Her with what is likely an M6