There's no iPad or Android tablet in the same league as a Surface Pro'.
True but the Surface Pro isn't in the same league as an iPad.
The iPad isn't always used for the same thing as the Surface Pro is intended for. The Surface is intended as a hybrid tablet/PC. On the tablet side it's going to be a long time before the Surface Pro can match the iPad in terms of infrastructure and app availability. Trying to compare a Surface Pro to an iPad (or Android tablet for that matter) really isn't a fair comparison. I think the demographic is different for the two devices.
I don't see anything (or, didn't ... I'm not on Win8 anymore) in the Windows App store that can touch certain iPad programs I have like "ForeFlight" (a pilots charting & navigation program). With my iPad, paper charts and approach plates have been rendered obsolete. Most of the Win8 "store" apps are far more basic than that. It's going to be awhile before companies producing top-flight programs like that come up to speed on Metro versions of those types of applications, if it happens at all. Personally I wouldn't want a Surface Pro in the cockpit with me; it doesn't have the battery life or the ease-of-use that my iPad3 has and, as much as I love Windows, I would not want a BSD taking place when I'm trying to navigate with a chart. The iPad is extremely stable.
I don't use my laptop and iPad/iPhone for the same things most of the time. Sure there's some overlap between the two but not as much as you would think.
It will be interesting to see how the Surface fits in. I don't think the cockpit is going to be one of the places it will fit. Maybe in the passenger cabin, but not up front.
-Max