Since the sound quality is such a subjective thing, it is quite possible that going from VK-200 to VK-220 in some system might provide a subjective improvement. However, as a general rule, the 220 should not be considered an upgrade to VK-200.
The two lines are designed using totally different approaches. The VK-200 is far more of an "audiophile" product, whatever on Earth that means... there are more elements and "good design practices" in it that most people would agree should lead to a better sound, and ultimately, in a properly designed system, it should produce better sound.
VK-220 is a compact package available at substantially lower price. Its design is more traditional (relatively speaking), but in my view its ultimate sonic potential is slightly below that of the 200/250 line.
From my perspective for a person who generally likes the sound of his VK-200 but would like to move to the next level, a VK-250 or even VK-250SE would be a more appropriate move.
Victor Khomenko
