A report by Michael Reichmann on the Contax 645 combined with the Kodak 16 Megapixel digital back in use in the Rocky Mountains. And although he does not describe the combination as ideal at all (too many minor inconveniences in operation and interaction, plus power consumption), he is enthusiastic about the results and counts them among the best he has produced.
At PhotographyBLOG I found the original article.