Yes, I see it and it's not pretty! I noticed it first in HD (after firmware update) and to a lesser extent in 4K. Switching between IS modes makes no difference but it does increase with ISO.
It makes HD footage unusable at 3200 if there's any movement of high contrast areas. The DV Info review points it out and theorises that the ghosting artifacts are due to an in-camera temporal noise reduction. The reviewer spotted it during a rolling shutter test:
Now that I've seen it in my own footage I can't unsee it! It seems to even be present, but very subtly, at 500. Whack up the ISO a bit, zoom in on a contrasty line and wiggle the camera a bit. You'll see it too ?
Now, I know the latest firmware "improved" high ISO performance in HD. But has it caused a worsening of ghosting? I took only a handful of shots before updating so I can't really check for sure. Of course, the sensible thing would be to have an option to disable all noise reduction but... it's Canon.