Thoughts based on comparisons found on Caps-a-holic: https://caps-a-holic.com/index.php?s=star+wars
I do not take in account contrast (due to wrong HDR-to-SDR conversion, I hope) or colors here, but only frame size and resolution.
EP I, II, III: UHD-BDs have the exact same resolution of BDs, but have a tiny less image on both top and bottom, and both sides are slightly cut and stretched.
EP IV: UHD-BD has higher resolution than BD, and more image on both left and right, but less on top and bottom.
EP V: UHD-BD has higher resolution than BD, but less image on all sides.
EP VI: UHD-BD has higher resolution than BD, and more image on left, but less on right, top and bottom.
I do not take in account contrast (due to wrong HDR-to-SDR conversion, I hope) or colors here, but only frame size and resolution.
EP I, II, III: UHD-BDs have the exact same resolution of BDs, but have a tiny less image on both top and bottom, and both sides are slightly cut and stretched.
EP IV: UHD-BD has higher resolution than BD, and more image on both left and right, but less on top and bottom.
EP V: UHD-BD has higher resolution than BD, but less image on all sides.
EP VI: UHD-BD has higher resolution than BD, and more image on left, but less on right, top and bottom.
