Consider translating the energy consumed into money (one can easily sell and buy energy). Then compare the rapport between the total value exchanged in btc and the total cost of energy with the rapport between the total value exchanged in fiat and the total costs incurred by the financial institutions and people to have that (the cost of buildings, the cost with employees, with their servers, with transporting and securing physical money, etc). That would be a much fairer comparison in efficiency.
And if bitcoin wouldn't be more efficient after the abive computations, the fact that people keep using it means it brings them some extra value for which they're willing to pay the premium costs.
And if bitcoin wouldn't be more efficient after the abive computations, the fact that people keep using it means it brings them some extra value for which they're willing to pay the premium costs.