General:
* Excellent
* Superb
* Exceptional
* Outstanding
* First-rate
* Premium
* Superior
* High-quality
* Fine
* Choice
* Prime
More specific:
* Exquisite (especially for beauty, craftsmanship)
* Elegant (for style, grace)
* Sophisticated (for complexity, refinement)
* Luxurious (for comfort, opulence)
* Masterful (for skill, artistry)
* Impeccable (for flawlessness, perfection)
* Top-notch (for excellence)
The best word to use will depend on the specific object or situation. For example, you might say a painting is "exquisite," but a car is "top-notch."