I recently flew HEL-PVG in business class in one of their oldest A340 (OH-LQA). While I have always considered AY reasonably good airline I was not too pleased with this flight.
Angled-flat seats were far from my liking and I slept no more than 2 hours during the flight.
The AVOD was big disappointment with poor selection of movies/TV shows.
Lack of storage space in the cabin.

Additionally the service was "just" ok. Not exactly enthusiastic and bit lacking in my opinion. No priority boarding.

My advice would be to choose 330 if you have a choice. Anyway the seat itself is one of the main thing to fly in business class.