I've been spinning the Miles Davis and Milt Jackson Quartet/Quintet SHM-CD a lot since it arrived and really really digging it. The two Bennie Green SHM-CDs are also excellent. This is a great series, and I have to stop buying discs for a while, or I'd be all over these. I hope they hang around for a while.
In this case the mastering is really making a difference, the "super hard material" may be making a bit of a difference, but the mastering is the reason to buy these imo. I like the mastering on the new Blue Note cds as well, but the improvements on these new Prestige masterings seems a bit larger to me. And interestingly in the case of the Blu-Spec 2 cds I've bought using masterings I have on regular cd, the Blu-Spec material and pressing method seem to have really had an impact as these sound improved, quite noticeably to me on my system, with the same materings.
I have the Lateef Prestige SHM-CDs in the mail to me, looking forward to them!