It's not a bad comparison.

The question is why is Apple not diving into a "productivity machine" like the Surface. The answer is that the iPad Pro is selling better than the Surface. That is: Apple isn't building the Surface because they built something that sells better.

> What percentage of those ipad are replacing laptops?

Think about what you're saying, why would replacing laptops be a priority for Apple if they can outsell hybrids 10 to 1 by focusing on making a great consumption device?

Apple and Google are focused on the mobile computing platform of the future which already outsells pcs with the gap widening every year.

Instead Apple uses their OSX product lines to compete in the pc market.

Who's talking about laptops? OP brought up that the iPad Pro is a reaction to the Surface, then the reply said that the Pro destroyed the Surface in sales. This has nothing to do with laptops, even if the sales on productivity tablets are pathetic, the Pro still seems to be winning those pathetic sales.