Here’s an interesting topic on the issue of scanning. The preference with restoration is to scan at 6K or 8K even if outputting to 4K as it resolves the information better. Although poita hasn’t said, his 4K scans may be captured at 6K or 8K and then outputted at 4K, according to the thread that’s actually standard practice. It probably explains why everyone seems to think Wizard of Oz was scanned at 8K when it was done on a Spirit 4K film scanner that has a maximum output of 4K according to these specs!

I just popped in my 2009 Wizard of Oz bluray and had a look - the most disappointing thing is they used the inferior VC-1 codec rather than AVC (Sirius Pixels) and the movie is only 21GB. For comparison, Deep Red 4K is 37GB and AVC (x264 encoder) its film grain looks better than Wizard of Oz. But WOO still looks amazing, and it was scanned on a Spirit 4K (according to the restoration video) which is now an older obsolete/inferior scanner compared to what ESB is being scanned on. The technology going into this project is incredible, on par with top commercial film restorations, and even better than what was done for Oz!