Little update.
Got K2HD version and compared to original mastering CD its clearly cleaner sounding. I am not sure how Mastersound, Blue or Gold CD are sounding, I just stop here, if you dont mind, but K2HD is the very best example of what new development / competence have to offer, at least thats the idea behind, I suppose.
Anyway, after several sessions through speakers, K1000 and GS1000, I came to conclusion that original mastering CD is the best and, honestly, I dont understand why they ever re-master the original tape.
Legacy Edition - EUR 5 ( surprisingly close to original mastering, but still not the same, having upfront and agressive tone )
Original Mastering - EUR 17 ( the sound is very natural and thats, to me, very important thing, highly recommended )
K2HD Edition - EUR 27 ( good job here, but only if you never heard the original record, also upfront and agressive tone are there )