There's a lot of latitude in "for the most part."
It really depends which features you value. After all, why do people buy Macbooks when they can get similar specs for less money from a Windows machine? Is it the build quality, the appeal of OS X, Apple's effective marketing, integration with iOS, or something else? Whatever the reason(s), in the $1000+ segment, things don't work out like they do in the lower tiers; Apple might only claim around 10% of the U.S. market, but when you consider almost all of the devices they sell are $1000+, you can get a sense of how much differently things work at the very top. I can see why Microsoft decided to target the premium market, and to mothball the Surface Mini.
The Surface Pro 3 is meaningfully different from current Ultrabooks thanks to its pen integration, at the very least. Eventually, pen support will pervade all of Windows, and this sort of functionality might become more common among OEM devices. But for now, it's at least one feature that helps the Surface stand out, and that could help it to gain a place in the high end of the market. It might not matter to all users, but as someone who's spent a lot of time with both Photoshop and Final Draft (two of them pen-optimized apps demonstrated this week), I can definitely see a market for this sort of tool. As analyst Jack Gold said in our story yesterday, when you sell expensive, high-margin devices, you don't need to move tens of millions of units to be successful.
I think the Surface Pro 3 is a pricey, but if Microsoft had just included the stupid keyboard for the same cost, that wouldn't be so unreasonable.