Finnair ordinarily flies the A330 between New York and Helsinki, which features their staggered, fully flat business class seats.
Unfortunately they don’t regularly fly their A350 to New York, which features their excellent reverse herringbone business class seats. I lucked out last year when I had the chance to fly the A350 between New York and Helsinki, given that Finnair operated the plane in the market for a very limited time.
Instead they choose to fly the A350 primarily to Asia, which is where most of their longhaul flights are to anyway. So far Finnair has seven A350s in their fleet, with another 12 A350s on order, so I hope that eventually they’ll fly the A350 to New York.