This is the second comparison that Tim and I have done with the Olympus OMD EM-5 and the Canon 5D MkII.
All of the footage was shot with both cameras hand held. The Canon footage was stabilized with the Warp Stabilizer in Adobe After Effects, and about 4 of the Olympus clips were. The OMD EM-5 five axis image stabilization does a really spectacular job of steadying the shots in both vertical and horizontal pans across the image. Both cameras display elements of rolling shutter, but the Warp Stabilizer does a really effective job of correcting for this.
This was produced as a comparison between the 5D and the OMD to see how well the footage integrates together in our current Adobe workflow, and to see how the cameras stack up when trying to achieve quality results with a limited budget.
My only gripe about the OMD EM-5 was some focusing issues when following a moving object. There are a couple of shots where the camera changes focus points for a split second. I know most people won't notice it, but I did, and it drives me nuts. Aside from this, I think the Olympus holds it own against the much more expensive 5D Mk II.
The original video was shot 1080p and had a final output size of 41 gigabytes. Do to the unwieldy size of the file, the uploaded version is 720p h.264 compressed.