But that is a silly comparison as most European full service flights are sectors which are less than two hours in length. Like flights within California or Florida!
Australia and South Africa are much more comparable in size. And Business Class is far higher quality than domestic First in the USA. (And Qantas and SAA coach have a soft product which is the equal of First Class in the USA).
As do US carriers on numerous longer routes like jfk-lax or atl-hnl