Now I’m curious to see the difference. Can you post some comparisons?
Your disc ripper probably tells you the frame rates. I think the Blu-ray was 23.97 f/s.
I couldn’t pause the exact frame in each but these are the colour changes in handbrake from .mkv to .mp4 with all kept sources. It seems that it can’t cope with UHD at all. The timing is slightly out of each format aswell which is really annoying for upscaling.