I don't think you can directly compare the prices of the coins, but you need to look at the reward that's at stake.

12.5 bitcoins every 10 minutes at 7277 USD/bitcoin = 9096 USD/minute

3 eth every 14 seconds at 132 USD/eth = 1697 USD/minute

then you'd expect the bitcoin miners to use 5.3x the energy of eth

EDIT: oh, someone already did the same calculations earlier a couple of comments below :)