Considering that Adobe's CS6 and MS Office are the 2 main productivity suites and main reasons that many say the Surface is better than any iPad for productivity and *real work*. Well... prove it.
Which brings me to my personal suspicion: CS6 is not going to run well at all, or be desirable to work with in the least on the Surface, with or w/o keyboard, mouse, larger monitor, pen... whatever. You certainly will be able to do a small subset of functions, but you're surely going to want a calibrated monitor and beefier processor/video card for the powerful layered tasks that Photoshop (for example) is best suited and used for.
Whether the Surface is a good tablet (or not) *today* in comparison to the iPad is mute point IMHO. Because Apple can easily scale up iOS, while Microsoft's approach is to allow developers to be lazy in regards to designing Apps and software for touch-based usage. Office as Exhibit A.
I'll say again as I did a few days ago in a post: Microsoft's tablet approach is holding software advancement & technology BACK rather than moving it forward.