Yes there are other companies that are currently shipping devices with efficiency equal or better than 0.75W/G.
Ok. Which companies? What are the products? How much do they cost?
I only corrected a statement. I'm not getting paid to offer you search services. Feel free to find out by yourself.
RoadStress is right. Also, there is a teapot somewhere between Earth and Mars orbiting the sun. I offer no proof to back up either of these statements, but feel free to find out their veracity by yourself.