This is where it gets murkey to me. Many people can meet their photo and video editing needs on an iPad. Of course, they have to jump through 100s of hoops to get the content on there in the first place. I'm not speaking of just getting RAW images off of a compact flash card - that something most people don't have to worry with. But my video camera shoots in ACVHD, and it's not even close to a pro level cam. I'm not saying the Surface Pro will handle it well, but it will at least handle it, and I won't have to preload the files elsewhere first. Still, video editing on an iPad is pretty darn good, but don't pretend it's not limited. Again, this is based on what you are trying to do. I tend to get into a lot more detail with my video edits than most consumers, but I'm no pro.
I've seen some amazing drawings/painting created on the iPad. However, I can get 10X the detail in 1/2 the time with a stylus. In order to get an accurate placement of a really fine line (on any of the apps I've tried) I have to 'spread' the image wider...and wider...and wider...until it is so large I can't even tell where I'm drawing anymore. A Wacom stylus isn't just an improvement, it the difference between a raindrop and an ocean. Yes you can draw on an iPad. A few people are very, very good (and patient) at it. They have spent countless hours perfecting work that could have been acheived in a fraction of the time with a stylus. Pen/paper - Paint/Canvas, both clearly superior to a finger based touch screen. Wacom Stylus is the closest thing to that.
These are the ones that hit closest to home to me, although I am a musician. I love jamming with the iRig, love creating with Garage Band. I haven't tried recording more than one/two part tracks on the iPad. iPad is not meant to replace a desktop recording solution, and in my opinion a laptop isn't either (not that I think you indicated that it was, btw)
Creating a presentation: really? It can absolutely be done. And it will absolutely take more time to get a polished custom presentation completed. Just because you can do it does not mean the device is really good for doing it on.
The iPad is great as a consumption device is it's present incarnation, but ranks poor for serious content creations. The Surface looks like it may improve upon the iPad in that area.