I have had these two cameras for 1 year almost to the day (delivered to me on June 6, 2016). They have had light to moderate use during that period. There is no wear and tear other than a very minor cosmetic dent (very small) on the mesh portion of the onboard camera mic. I cannot go lower than $4,000 ea. as I am looking to take the combined $8,000 for a purchase of a single camera in that price range.
I also have 2 metabones adaptors to accommodate my canon lenses. If you are interested in those we can discuss a sale price.