En este contexto lo diría así.
Free Dictionary:
world-class (wûrldkls)
adj.
1. Ranking among the foremost in the world; of an international standard of excellence; of the highest order: a world-class figure skater.
2. Great, as in importance, concern, or notoriety.

The American Heritage® Dictionary of the English Language, Fourth Edition copyright ©2000 by Houghton Mifflin Company.
Updated in 2003. Published by Houghton Mifflin Company. All rights reserved.

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Adj. 1. world-class - ranking above all others; "was first in her class"; "the foremost figure among marine artists"; "the top graduate"
foremost, first
best - (superlative of `good') having the most positive qualities; "the best film of the year"; "the best solution"; "the best time for planting"; "wore his best suit"


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Note added at 9 mins (2005-02-23 16:28:15 GMT)
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o: en otras ciudades importantes