I compared how well my OLED 4K TV upscales DS9 and B5 played directly from MKV rips of the PAL version of DVDs. The B5 video appears to my eyes quite a bit sharper and detailed than the DS9 one apart from the CGI sequences in B5, which were cropped to create a widescreen format. I believe this might be because the PAL DVDs for DS9 were converted from the NTSC versions, whereas the PAL DVDs for B5 were taken from the original PAL scan of the film created back in the 90s. IIRC both PAL and NTSC scans were done for B5 - I might be imagining this, however.