DisplayMate did a new shootout using the Surface RT, which can be found here:
http://www.displaymate.com/Surface_RT_ShootOut_1.htm
This quote summarizes pretty nicely:
"The display on the Microsoft Surface RT outperforms all of the standard resolution full size 10 inch Tablets that we have tested in our Display Shoot-Out series. The Lab tests and measurements documented in the Shoot-Out Comparison Table below indicate that Microsoft has paid a lot of attention to display performance for the Surface RT. In particular, on-screen text is significantly sharper, it has a better factory display calibration, and also significantly lower screen Reflectance than the iPad 2 and all full size 1280x800 Android Tablets. But it is not as sharp as the iPad 3 or 4, nor does it have their large full Color Gamut."
A few quotes:
"The Surface RT uses Sub-Pixel Rendering (called ClearType in Microsoft’s implementation) that in our tests significantly improves the visual sharpness of text over standard Pixel Rendering that is used in most mobile displays. In our comparison tests, text on the Surface RT was significantly sharper than on the iPad 2 and all 1280x800 10 inch Android Tablets, but it wasn’t as sharp as the iPad 3."
"Our Lab measurements found the Surface RT to have the lowest Screen Reflectance of any Tablet in our Display Shoot-Out article series. The Surface RT also has the highest Contrast Rating for High Ambient Light for Tablets..."
"The Surface RT has a smaller 57 percent Color Gamut, which is disappointing in an otherwise excellent set of display performance specifications. While that‘s comparable to most existing LCDs in Tablets and Smartphones, many mobile displays are now coming with larger Color Gamuts from 80 to 100 percent, which significantly improves color saturation, accuracy, and vividness."
It's a shame that the color gamut is so narrow, although the statement from the article that it's probably a power efficiency tradeoff makes some degree of sense. It'll be interesting to see if the Pro has a wider color gamut given that weight is less of a consideration.
One interesting point is buried in the tables near the end. One category where Surface outperformed the iPad 3 was "Screen readability in bright light." This is one of the big measures that MS was talking about in terms of subjective performance under "real world conditions." The degree to which you use a tablet either outside or near uncovered windows on a sunny day probably affects the degree to which this is important to you.