Curious, are there any competitive PC ultrabooks to this mythical rMBA?
i.e. Retina resolutions and haswell chips?
You got the Samsung Ativ Book 9 Plus which for a Windows ultrabook is quite nice.. But sadly it features a pentile matrix display .. It's like Samsung has given up and just markets their display as high resolution even though they lack half of the red and blue pixels of a normal LCD display. But there is currently nothing like it in terms of "ultrabook" right now other than the MacBook Pro 13" Retina which technically is not a ultrabook.
The only problem is the fact that its utterly overpriced for what it is, those who claim Apple is overpricing the products should really take a look at the direction Samsung seems to be heading. The Samsung Ativ Book 9 Plus and their new Samsung Galaxy Pro tablets are ridiculously for what they are.
And the poor Intel HD 4400 is simply not capable of handling all the pixel when you try to do anything other than 2D work. And the high-resolution display got some really nasty colour shifting issues as well as the text being fuzzy at times due to the pentile matrix being noticeable as this display doesn't not feature the same density as their mobile phones who normally get by it due to the fact that the PPI is so high that even though pentile is not as sharp it's hardly noticeable. But on a 13" it becomes another story.
And you got the fact that even though Windows 8.1 does HiDPI scaling just fine, barley any of the Windows software does. The high-resolution display is rendered rather useless when Google Chrome does not feature HiDPI scaling making text looking like a blurry mess, actually worse than normal low-resolution displays and that goes for about any third-party application which there are a lot of using Windows. And Adobe does not feature scaling at all making the UI-elements so small that they aren't really usable for anyone forcing you to lower the display resolution in the settings if you want to be doing anything.
They've got a long road ahead of themselves in order to get the scaling working in Windows due to the fact that pretty much 90% of all applications people are running is considered legacy. Barely any use any of Microsoft latest and greatest developer tools and languages and wont use any of the newer APIs making HiDPI something we wont be seeing in the majority of applications for a very long time.
And putting a 3200x1800 resolution (only 1600x900 for red and blue subpixels) on a Intel HD 4400 is another stupid move by Samsung. It comes with only 128GB SSD's have of the units shipped seem to be feature SanDisk SSDs.... For the price of $1'399,99 it's rather ridiculous.
Lenovo and a few others are also working on 3200x1800 ultrabooks, but they all seems to relay on the Intel HD 4400 and they all seem to be using the same LCD panel having huge trouble with yellow tint all over the display. And they will all face the exact same problem with Windows and application scaling.