"I think (Australians) are just excited about this phone," Mr Fink said.
"It's not just us but globally - all the markets are reporting double-digit growth on the S7 launch.
"Australians like big-screen phones, and the screen dimensions are something different."
Even after the worldwide recalls, Samsung reportedly sold more than half a million of the new phones in South Korea in just two days after presales began.
The Samsung Galaxy S8 and S8+ will feature larger 5.8 and 6.2-inch screens with tiny borders, a water-resistant body, improved selfie camera, and a smart assistant named Bixby that takes voice commands.
However, Samsung confirmed Bixby would not recognise the Australian accent at launch and its voice commands be missing from the phone initially.
Samsung spokesman Eric Chou said the company was still in the process of programming Bixby to recognise Australian voices.
"It is continuing to evolve," Mr Chou said.
"In the coming months we'll have an announcement about what we'll do with Bixby voice."
The Galaxy S8 and S8+ would feature other elements of the Bixby assistant, he said, including suggestions based on the user's calendar and the ability to recognise photos of landmarks and objects.
All major Australian telcos have announced plans to stock the Samsung Galaxy S8 and S8+ on April 28, with even unexpected firms like Woolworths also offering the phones on plans.
Buyers who pre-order will receive the phone from April 21.