Edit: Also anyone charging on a regular 120v outlet, which is really all most people need for at home charging, is in the low 80's. Also Wiferon has ones commercially available at 93%.
I'm curious why you are downvoted?
When searching "wireless charging efficiency" on Google, Google offer this short explanation:
The efficiency rate of inductive chargers usually falls between 70% and 80%, though some newer models boast efficiencies closer to 90% under optimal conditions. This is slightly lower than the 90% to 95% efficiency rate often seen in traditional wired charging.
Not too far off from the statement above that 93% is already available, and apparently progress is being made.