Keith, look at the Cine Alta forum. I was faced with the same purchase decision and decided on the EX1 for many reasons but they may not be valid for you.
Rather than repeat here I’ll point to this post
https://forums.creativecow.net/readpost/142/856334
Both Cameras are good.
My own experience is the rolling shutter skewing is exaggerated by many. The EX1 is NOT a V1 and it takes an extreme circumstance to get it to happen.
The EX1 4:2:0 keys and composites fine but 4:2:2 has advantages. But those numbers don’t exist in isolation. In this case the 4:2:0 is attached to 1/2″ chips at 1920×1080 and that outweighs the 4:2:0 for me (but maybe not for you?).
Keep in mind the EX1 does have HD-SDI out at 4:2:2.
There’s also a lot to be said in handing a client a disc with the Sony clip browser or a Blu-ray disc with the file extension changed to .ts for easy client viewing.
I suspect Panasonic will respond with a comparable camera though. Competition and technology works that way.
Both cameras are good though. Different features, choices, advantages, disadvantages. There’s no “perfect” camera but you have a choice based on your (your client’s) needs.