I flew AY J in May BKK-HEL-CPH-(HEL)-BKK. I purchased one of these discount fares, at the time around AUD2,300.
The flights out of BKK are all on new A350s (which is configured the same as the CX flight I took in January BKK to HKG). Very comfortable although not super spacious. I found food etc to be much better than the standard AY flights I have taken previously. The crew seemed to be very proud of their new aircraft ad went to great lengths to make me comfortable.
The AY flights in Europe are much more basic. For business class you normally just get an empty seat between you on the window and the passenger on the aisle. Otherwise it is an economy seat.
I agree with Clifford that the AY lounges in HEL are on the small side and are usually crowded. In the case of my last trip I didn't even bother going in. There were more people in the lounge than outside. This is something Finnavia and Finnair need to fix.
As for QFF SCs, I got full business class SCs. For the BKK-HEL sector, I got 120 SCs and for HEL-CPH sector, I got 40SCs. So 320SCs all up.
I also opted for a discounted economy fare on QF from SYD-BKK-SYD at around AUD650. So the total trip was under AUD3,000.
Please note that the connection times between QF and AY through BKK are not ideal. I opted to stopover in BKK both directions. Hotels are cheap there at the moment, so it wasn't a big cost - and it gave me a few days in BKK, a city I love.