What a pleasure it was to shoot with the Ursa 4.6k. Beautiful image and grades so easily . I did encouter the "corrupt card error" on both cards. A workaround is to load your footage through thunderbolt instead of usb and the error will be gone.
Not entirely convinced with the Xeen lenses. They are robust and great to handle but the image quality compared with the Samyang cine lenses is minimal in my opinion.
But I'll give them another try.