It's winter, the perfect season to sip a glass of whisky on a long, quiet night to warm up, as well as a good time to sample the variety of quality whiskeys available on the market.

Over the past 10 years, the quality of Japanese whiskeys appears to have markedly improved, to the delight of many.

The bad news is that the number of whiskey drinkers has dwindled during the same period, prompting distillers to diversify their product lineups.