I received the couple (gently used) DVD-A discs a week + ago and have been playing against their CD counterparts...I have to say, conclusively, that DVD-A is simply a better recording process than CD.
I simply cannot stand Neil Young's 'Harvest' on CD; it truly hurts my ears to hear it. Despite my cleaning ritual of Koday optically lens cleaner, application of LAT International's C Diamond (CD Performance Enhancement and Anti-static Treatment) and a good dose of Bedini's de-gausser. Usually, these things help a tad, but for this disc it's near useless.
The vinyl version sings with the pain that Young is experiencing - he reportedly recorded the album while in a body cast (he has never been a healtlthy guy); rich in glorious pain, for all the world to hear. The CD is simply abysmal - the only pain you hear is that of your own ears and wallet having been subjected to buying it in the bargain bin at Tower Records for $9.99.
The DVD-A, while it doesn't convey the 'wholeness' or soul of the vinyl version, is at last resloving and hints at it's greatness. You CAN listen to it - even with a Class Z

audio/video system it's being played on. It simply takes the analog masters and renders them far more faithfully then the CD version. An interview with Neil Young in 2002 confirms his satisfaction with it. It's more resolving, more whole sounding, has less irritating midrange, warmer, denser bass and a high end that extends fairly benignly.
It rivals vinyl in a ways CD never does and never can; but it
almost as convenient (unfortunetly, I know of no DVD-A boomboxes, walkmen, clock radio's and only a couple DVD-A compatible car players

)
Digital recording takes a lot of space and I think the culprit lies with the limited space available on a CD, versus a DVD...perhaps more so than the higher sampling rate of DVD-A.
Tho the format seems ultimaely doomed, there is so much good music on it now, an investment in a decent player seems warranted. As I tried SACD was was thoughly dissatisfied, a universal player isn't needed; merely a good DVD/DVD-A player. I'm leaning towards the Cambridge Audio AZUR 540....
http://www.cambridgeaudio.com/summary.php?PID=16&Title=Azur%20540D%20the%20DVD%20player%20of%20choice%20for%20perfect%20picturesYou don't need to spend as much on a good DVD-A player because it starts off at such a higher level....merely very good will get you excellent sound for the money.
Folks, spend as little as possible on CD...it's a has been/never was recording medium and process. No amount of lipstick (upgrades, doodads, addition of DAC's) will make that pig lovable. Yes, you can get better performance from it, but if you find yourself frustrated at having spent a lot of money on it without satisfaction - it ain't nothing you're doing wrong; it's just not a great recording format. It's convenient, but nothing more than that.
DVD-A is simply better - confirmed completely to me now.