Despite it's "lossy" provenance, the original DTS 96/24 DVD-V mastering of Chicago Transit Authority is much closer to the tonality of the original stereo and quad vinyl than the subsequent BD-A version. CTA is one of my most-listened to albums of all time, and I say this as someone who's owned almost every iteration of this album, including the original GP8 vinyl, the quad vinyl, the original Columbia CD issue, and the MasterSound SBM CD amongst others. .
The quad mix may not be "perfect" - I think the slight harshness of the quad mix can be accounted for by the fact that it was mixed at Caribou Ranch and not at CBS New York - but it has an almost impossible task to live up to given the fact that the stereo mix is one of the best-sounding to ever come out of CBS' New York facility and a remarkable accomplishment in fidelity for xomething recorded in 1968. Bob Vosgien, who mastered the Quadio DVD-Vs of CTA and Best of Aretha Franklin (and who participated here on QQ for a time) has a phenomenal ear and I think his participation in the current iteration of the Quadio program would enhance its value immeasurably.