I'm not sure if this is something that Mojang intended to do, but the ID for a powered comparator is minecraft:unpowered_comparator [metaValue]
Facing North, the meta value for a truly unpowered comparator is 0. However, as soon as it is powered, it turns into 8. If this is not a bug, will Mojang making the ID for a powered comparator it's own? Repeaters currently have their own ID if they are powered, so why don't repeaters?
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Resolving as Working as Intended:
http://minecraft.gamepedia.com/Data_value#Redstone_Comparator
In 1.5 BlockId 150 (active) is used for the power state and the 4th highest bit is not used:
From 1.6 on BlockId 150 is not used and the power state is determined by the 4th highest bit:
Yes, the Wiki is not reliable to confirm issues, but the status quo described there is correct.
Nevermind