I had Battery Drain while turning on GSM Radio. When GSM Radio is turned off while the rest feature (e.g. Siri, Bluetooh, Wifi, Location Service, iMessage, iCloud, you name it) turned on, I can say no issue on the battery drain.
Turning on GSM also had an intermittent signal reception, call failed issue, and the phone tends to heat up even without any activity -- this heat up issue I believe also due to I live in a quite hot country, but still it's unacceptable since other iPhone model didn't suffer. This could be a safety issue, as an iPhone suppose to work as a Phone. You can imagine if the phone doesn't work when you're on emergency.
I have no clue the influence of this council, but anyone with facebook account might want to click "Like". Probably with more "Like" counts, it will be able to push apple to bring this Battery drain issue as a priority.
Have a look at:
http://ncconsumer.org/Will%20iOS%206%20Finally%20Fix%20Battery%20Life.html