Microsoft Research has been testing a technology they're working on called Room2Room. The point is to see how well "augmented reality" works, and whether people prefer it to basic online face-to-face communication -- or even how it compares to in-person meetings.
For the test, Microsoft set up two rooms with Kinect depth cameras and projectors, and then sent life-size 3D images to each room. (Obviously. a 3D graphic isn't going to translate to everyday 2D content and will look flat, but here's the best we can do...)
Obviously, this is hardly definitive results, and a very early stage. After all, maybe it took some participants longer because they weren't as good at solving puzzles. I couldn't tell from the article how many tests were done, and how many people took part. It read like there was one test for each format, but I have no idea. That said, these very early results don't seem out of line with what one might possibly expect -- though it's impressive that the Room2Room technology did as well as it did.
The full article by Liam Tung and interesting details are here.