I know there are movies now mixed in 6.1, but are there any movies mixed in 7.1?

I have only heard 7.1 once, and it was using a movie that was 5.1 and simulating it as 7.1, and it sounded better.

I was just wondering, because I see a lot of 7 channel amps, but only 6.1 movies, and decoders/preamps/processors.