Ben, I agree that Ms. Krall is not for everyone...inc. me. But until we have Sarah Vaughn, Ella and others on SACD my choices are limited.
The only proof I have is the same I've had for the 30+ years that I have owned high-end audio...my own listening experience.
In my comments above about the SCD-1, it is a shame that so many people/systems out there are striving for good sound and trying different speakers, tubes vs. solid state, copper vs silver wires..etc. and their source component..be it CD, SACD, Tuner..whatever has very poor op-amps that are the begining of the signal through the system. These op-amps would never be desired by any of you in your pre-amp...if this were true we could all dump our tube or fet-based pre amps and buy and old Adcom 565 pre-amp with those class A op-amps.
Anyway, live and listen how you want...I just won't have my source component be so compromised that it makes efforts throughout the rest of the system not usless...but not far from that. This is why so many good people out there are doing modifications on SACD machines. This was just not the case(to the same degree) with CD players...but the room for improvement in SACD machines is so obvious because of this multi-format path making for $ compromise in the sonic areas of these players.
I do want SACD to succeed, and I want to be able to buy a player that on an SACD disk(hybrid or not) will sound better than a redbook of the same title on players like the ARC CD3, Ayre....and others..and that is just not the case now...unless you buy a Sony SCD-1 and put 2k plus into mods.