высокопрофессиональный(extremely good: "top-notch scientists/lawyers/artists. CBED. We need to offer high salaries to attract top-notch staff. CI Alexander Demidov)
высококлассный(extremely good: "top-notch scientists/lawyers/artists "The state school system offers a top-notch education. "The new conference centre has top-notch facilities. CBED Alexander Demidov)
высококлассный переводчик(Try translating a few texts that have already been translated by a top-notch translator. The aim is not to see whether you've done it right, but rather to analyze how the experienced translator made his or her decisions.Alex_Odeychuk)