Marek:
Moreover, in much base vocabulary, Polish is understandably more Westernized, drawing heavily from French, German, Italian, i.e. Latin, even Yiddish-:)
I'd be skeptical of that claim unless it's backed by research (comparing both dictionaries and corpuses of usage).
Generally when it comes to 'educated' vocabulary (dealing with politics, humanities and sciences) the Slavic languages use a mish mash of westernized and indigenous vocabulary, often simultaneously (Polish 'auto' and 'samochód' or Czech 'muzyka' and 'hudba') and I don't know which has the largest "western" stock.