Under Jobs' leadership, Apple has done 10 times the amount of relevant homework of most companies — internal competitions, supply chain training, endless deal-making, endless recruiting, training, and generating and sustaining employee excitement that you just can't fake.
If others emulated that, all of that, their results would be a lot more like Apple's.
Apple has fairly high profit margins on their products, and this allows them to spend more on development and marketing. I think a lot of companies wouldn't be able to support such a model.