@mambo1888 - I'd be really interested to know how you get on over the coming weeks/months.
Just reading through all these comments and overall it sounds as though Cinema Paradiso is pretty good at delivery 4K blu-rays near the top of your list in a timely fashion (current COVID issues aside)?
I'm in the process of installing a 7.2.4 Atmos setup (will be ready in August) and while I had intended to only stick to SkyQ and my Apple 4K TV with streaming services, I'm tempted to now buy a Blu-Ray player and sign up for CP for a Friday/Saturday night type "movie night" where 4K and the full sound package works.
I'm leaning towards cancelling my Sky Movies subscription (£10 pcm and barely used, especially now Disney+ has the kids films on) and using that to offset the cost to sign up for a 2-3 disc unlimited CP subscription. This seems the most sensible and cost effective way to go about utilising the new setup, rather than spending a lot of money on some sort of media server platform (e.g. Kaleidoscope) or having to spend £25 per pop on a Blu-Ray every time I want to watch one.