Still the hashrate is relatively low and will continue to grow rapidly in the near term. 5,000 TH/s by December isn't impossible. At that point using your numbers the Avalon and Bitfury are spending 30% and 10% respectively on power. For the same amount of hashpower the Bitfury is making 28% more net revenue. Actually I think your calculations are a little off, maybe you are looking at chip efficiency not
power at the wall.
At 10x current difficulty, it would be 30% for Avalon, but still only 3% for Bitfury.
Meanwhile full sized miner is falling quite a bit short (10-20%) on hashrate, but the powerconsumption is.... 250W AT THE WALL.
320-360 GH/s @ 250 watts, AT THE WALL.