While there are a number of positives for the industry, there was some concern that the apparent upside is becoming increasingly concentrated in the hands of the country's largest producers, he said.
One of the key factors favouring New Zealand's larger producers was their ability to source suitable distribution in key growth markets and channels.
This was especially significant given the US, where distribution is so crucial to success, edged out Britain as New Zealand's largest export market in 2015, he said.
Early this month, New Zealand Winegrowers chief executive Philip Gregan said the grape harvest was looking at a significant improvement on last year's grape harvest of 326,000 tonnes.
There had been good growing conditions in Marlborough - where most of the main export - sauvignon blanc - is grown. He said the smaller wineries around the country have enjoyed a boost from strong growth in the tourism sector.
Gregan said quality was looking good and the wine sector had been a big beneficiary of the NZ dollar's decline against the US dollar.