Do you think the video quality of the OMD EM5 is better than the E-PM2?

I have just purchased the E-PM2 as a back up for my OMD EM5 for an upcoming African safari. I plan on putting my 75-300 mm Olympus lens in the EM5 and the 12-35 mm Panasonic lens on the E-PM2.  In trying the E-PM2 out, I love the quality of the stills (same sensor as EM5), however, I was somewhat disappointed with the video (I was shooting in the JPEG format). I believe I am seeing the compression artifacts described in an Imaging Resources review where they stated: "Heavy compression artifacts can be seen at all video resolutions, especially in 1080p whenever there are moving subjects or the camera moves. It's not as bad in Motion JPEG format, but it's still noticeable. Moiré patterns are also prevalent."

I am planning on shooting mostly still photos but I do like to shoot some short video clips. I know from perusing the reviews that Panasonic has superior video quality but I don't want to buy the Panasonic as a back up camera since I am already familiar with the Olympus menus, etc. Imaging resources had this to say about the video quality of the E-PM2:

This is what Imaging Resources said about the EM5's video performance: "Shooting in the daytime, the Olympus E-M5 is capable of providing quite clean and detailed video, with excellent detail in areas of subtle contrast. This is shown nicely in the bushy grasses at the beginning of our Full HD day video, which shows excellent detail where a lot of cameras dissolve to mush. Unfortunately, we saw some odd, sharp-edged and quite strong compression artifacts in the face of rapid motion"

If both cameras use the same sensor, shouldn't the video quality be equivalent?

In doing some limited testing on my own, I do feel that the OMD EM5's video quality is sharper than the E-PM2. I have been using the Panasonic 12-35 mm F 2.8 lens on both cameras in my testing.

I am not sure if I want to keep the E-PM2 because of the mediocre video quality. My other option is to look for a used OMD EM5 for my backup camera (much more expensive!)

What has been your experience shooting video with the OMD EM-5 and the E-PM2?

The OM-D has the better stabilizer, which should influence your end-result.

Panasonic (GH-2?) may be a better solution for your video needs, as Olys don't have optimal options for video.

Can you upload your E-M2 video, the one that you find disappointing.  Perhaps, you can ADD a note, on what time frame in which area has those nasty artifacts