The proof will be in the listening. I’ve never had great experience with the sonics of the Motown/Tamla releases- the best sounding ones were cut by Kent Duncan in my experience. Many sounded wooly and muffled. One of the best of the Stevie Wonders was the Musiquarium - a compilation album. (My recollection is that SWonder has possession of the original masters, not the label).
I do have a copy of What’s Going On- it is a reissue, possibly from the ’80s that was given to me-- apparently the ’forum fav’ on Hoffman. It has a noticeable lack of bass, having heard this copy on several different systems.
There are also different mixes of this album.
I think you really have to like the music to spring for hundred dollar records.
I pre-ordered a UHQR and a one step a little while ago to see what the fuss is about, having not purchased any of them (I had a UHQR of Tea from the old days of MoFi that was quite dramatic, but preferred the sound of the original UK Island pressings). I know these are different critters. No criticism intended to those who spring for these if it is something you enjoy. I’d rather spend my money on music I don’t have, rather than buying and rebuying every incremental "improvement" of the same record-- but if you like the music, I get why you’d re-buy.