What Miraslav had was beautiful - all of the recordings were excellent sound quality, and the performers were probably at least as good as the VSL. However, it was from about ten years ago, and VSL has literally ten times the data (actually somewhat more) and includes multiple dynamics on chromatic samples - none of which Miraslav had. Also, and as crucially, the MV never had anything remotely like the alternation or legato tools.
I am reworking a major recording project I did with the Miraslav Vitous samples to use VSL, and what I notice most is that with MV even though there were many great sounds much of the time one would have to fake something - using filter and volume to get a pp out of an mf sample, or overlapping ends and beginnings of samples to get a "legato" effect. However, with the VSL, you do not have to fake anything, even subtle things, and it makes all the difference in the world.