I personally think Blue Note recordings are relatively poor compared to most other jazz recordings of the period, but I'm curious how much improvement Hoffman's mastering and use of modern high end equipment makes compared to Rudy's original.
If you're expecting the reissues to be an improvement over the original Blue Notes in terms of sonics then you are likely to be disappointed.
I'm a little surprised to see that that you think the Blue Notes have poor sound relative to releases on other labels of the period, since Rudy Van Gelder left his fingerprints all over a lot of jazz for a great many labels during a 12 year period beginning in the mid 1950s: including Prestige, Verve, Riverside, Savoy, Jazzland, Impulse!, and Blue Note. About the only labels that Van Gelder did not record and master for in that period were Columbia and Atlantic.
On the other hand, I know that Van Gelder is not without his critics. Charles Mingus didn't care for him at all and refused to use him in recording sessions, for example. Some have complained that Van Gelder butchered the sound of certain instruments, such as piano.
I suppose the records and sound agree with me and I think they sound just fine. I don't have a lot of original Blue Note deep groove pressings, but I have some. I think that the 45RPM reissues do justice to the original recorded sound on the master tapes. They are comparable to the original Blue Notes in the few cases where I have both. Barring pressing defects courtesy of RTI, the reissues are noise free.
--Jerome