UJQRs of Supertramp Crime of the Century and Earl Klugh Finger Paintings are amazing as are the others (Dark Side, I Robot & Sgt Pepper). I have to say though, I never bought the Cat Stevens one (got all these back in college) and recently got the Acoustic Sounds QRP one and it sounded great to me - maybe UHQR level.
I had the regular MFSL Finger Paintings and Dark Side and own the Beatles MFSL collection, (which of course has Sgt Pepper) and I would say the UHQRs are noticeably better, but I am not as critical a listener as Miller Carbon or Mike Lavigne and haven't gone out to look for a better sounding copy of an album I already own that I like (except back in the day with the UHQRs).
The only exception to that is Kind of Blue, which I owned on 200g Classic Records and then bought the MFSL 45 box set (second release which supposedly sounded better than the first) which I like more. In general the 45s are better, but you have to get off your butt twice as often. It's worth it. My brother in law has the 4 LP single sided version of it which I haven't asked to borrow to test, but I've heard that is the best one.
I am not a collector looking for investment gains - I listen to all of them, but I did sell the Kind of Blue one to a record store and the owner was just going to keep it for his collection. The records should be enjoyed - they are not stamps or coins or baseball cards!
I do have the occasional regular release and I am sure several of those are white hot stampers (maybe they were the first pressings off the plate) Pat Metheny Offramp and Earl Klugh/George Benson - Collaboration come to mind. Some Japanese pressings are great too, but they vary (as I guess all do).