I recently got a 15″ Retina Macbook Pro. Of course I installed Windows 8 in Bootcamp (accessible via VMWare Fusion) and I was blown away by how beautiful it looked. The fonts are a little smaller at 150% than they are on Mac OS X, but still completely viewable.
Most applications handle the super high 2880-by-1800 resolution and large fonts fine. Mac OS X probably has a higher ratio of apps that look nice versus those that are a little odd looking, and it degrades better, but it is still a fabulous experience. Bumping the font size up to 200% makes matters worse though.
If you want the full resolution even when you are in VMWare (it defaults to the scaled resolution) there is an option to enable that too.
The fast SSD, RAM and Quad Core i7 are nice too.