I've got the Rush "Studio Recordings" box sets (from around 2014) and they had HD versions of some of the albums, which are quite good.
I also prefer/collect the "mini-LP" versions of CDs versus the jewel-case and digipack ones, so they ticked that (ahem) box.
I am slowly picking up HD versions of albums, be they DVD/Blu-Ray or from HD Tracks; some of them are better to my ears, but others aren't much of an improvement (Black Sabbath's mixes have Ozzy too loud and the drums lost, whilst Led Zeppelin's are a bit too trebly).
I have to say the Giles Martin remixes of The Beatles albums are really worth checking out (on plain CD).