I own the K2HD sampler, and it is very good. However, I can't really judge the whole K2HD catalog, as I find SACD slighly superior, and less costly. It depends on how much you want to spend for high quality digital.
Agree with Rwwear - the K2 HD discs sound amazing. Even if SACD is potentially a better technology, the quality of the FIM recordings make them sound better than most SACDs. If you only have a Redbook player, this the best sound you will find. The downside is that most of the music is pretty obscure - mostly good demo stuff. Try 'The K2HD Sound!' sampler - tracks 1,2 and 16 are the best demo material you will ever find (if your system is up to it).
A friend of mine just lend me a copy of Anitphone Blues in K2HD. I already have the SACD version so I can do some comparisons tonight.
One thing I noticed, for some reasons, the K2HD disc only has 11 tracks vs. 15 tracks in the SACD version; and two of my favorite tracks: "The Shepherd" and "Hymn To Freedom" are missing.
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