Is VP9 in much use (compared to VP8)? I've definitely heard good things about it, but I have no idea how well supported it is or whether anybody has it in use yet.

Oh does my iPhone have a VP9 chip in it?

Not so superior...

This is not true. My work, written three years ago, showed that VP8 was inferior to H.264[1] at the time. A more recent paper showed that both VP8 and VP9 are inferior to both H.264 and HEVC[2].

[1]: http://blog.seancassidy.me/h264-and-vp8-compared.html

[2]: http://iphome.hhi.de/marpe/download/Performance_HEVC_VP9_X26...