Did you get to test any true 4k material through the HD621, eg from the Sony server they sometimes use for demoing 4k?

I will not remove my Lumagen - the Sony 4K has no CMS at present and so the Lumagen will be used for that purpose. I very much intend to use the 4K Lumagen when ready to be able to do the same for 4k sources.

At this stage I intend to use my ISCO III with the Sony. I don't think I can throw a 2.35:1 image from my projection distance and so the only solution is the anamorphic lens. I'm right at the end of the throw range for the 16:9 image, so the lens is still required. I hope the ISCO is compatible with the Sony's lens...