Looks like the German 4K UHD disc is 1.85:1. I assume its corresponding 40th Anniversary Edition BD is the same. Are you 100% certain Turbine didn't release their previous Ultimate Collector's Edition BD in the same AR?
I also notice the UHD disc's listed audio doesn't correspond to its Caps-a-holic report. Is Auro-3D 13.1 somehow coded as 7.1?