3)
The theoretical achievable quality I can not judge. But SACDs are very often more carefully produced. So even old recordings may sound nice.
SACD may be produced in multichannel, some are very delightful.
2) Prices are comparable to those of CDs, at least for my point of view.
Search at Amazon, for example "Pink Floyd SACD".
1) Others may know.
I am using a Pioneer DVD player which "eats" all sorts of disks.
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And than there are
Audio DVDs with higher technical performance and multichannel.
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And then there are audio disks with
DTS.
I own "Sting ... nothing like the sun" in 5.1 multichannel. (My player eats.
)
Who has more details about
DTS?
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Peter