I know all of that, but I'll stick to this thought : no matter how thin the iMac Pro will be, it will be compared against desktops. Because no matter how power hungry a Desktop is, it doesn't really matter. It doesn't have the concept of "battery life".
Also, Apple is not Intel, but you know for sure it gets compared all the time against Intel. It will continue to be compared for years to come. To, you know, validate that the transition was worth the shot.
The problem with this is it will only be little bit faster if that than may be Intel top of the line CPU. If Apple is going to make iMac thinner knowing Apple and use mini case knowing apple in the Mac pro it is not going to be 30% faster or more.
If Apple would use more power in the desktop computers and use a desktop tower case with heat sinks and lots of fans than Apple could win over Intel than just being little faster at best with comparing desktop to desktop.
Not saying it has to be jet engine the fans but quite is not the answer. It would have to be like most modest windows desktop computers.
So if OS did not matter to me I would pick Apple over the laptop as Apple is winner here , but if Apple cannot come up with better CPU in iMac and Mac Pro. Than on par with Intel Apple is not winning or Intel is not winning by 4% difference by desktop vs desktop. And Intel may win more with overclocking and building computer your self.
Where only Apple is winning is in the Tablet and netbooks blowing any thing Intel throws at at.
But on desktop per desktops only winning or losing by 4% at best. And they both on par than winning or losing when it comes to desktop.
Is not enough win over fans when AMD and Intel will have better CPUs out by the end of this year. And with building desktop computer your self making upgrades and repairs easy and moving into overclocking.
Even if all the windows games and windows software could work on iMac or Mac pro a 4% difference win or lose is not enough to win over fans with more PC options to choose from unless you really like MacOS over windows.
If apple really wants to shine it going to have stop with the obsession of thin and lightweight desktop computers that are just sitting at the desk all the time. And make proper desktop tower that is easy to upgrades and repairs easy and blow away windows tower desktop computer. If all the windows games and windows software worked on MacOS to win fans over.