I have found the EX to produce a great image until you move the camera- 1 out of every 15 frames is a full image. We used the EX as a B-cam (900R) a-cam) and set it up in 1080 24P HQ mode. When we projected the cut, all the images that had a pan or tilt employed in the shot had some distortion which upon closer inspection seems to be small dissolves in between each frame. (The EX-3 has the same issue as well.) We in turn had to dump the shots that had camera movement as they were unacceptable.
The bottom line- The EX is a great image-producing still camera- The compression that takes place in the camera to the cards is too great to give you a respectable image in the end. I would wait until Sony addresses this issue before you purchase one.
cheers