Thank you all.
It looks like it might be CX on the way to Tokyo (afternoon is better for me), but on the way back I'm definitely considering JL, based on your replies.
The thing is - I need to be in Japan on August 21st for a big sports event, until the 27th. Flights to Japan from Europe that time of the year are incredibly expensive (we're talking €900 for an economy class ticket!) so I'm seriously considering taking the QR business class offer to Thailand for the same price. From Thailand I'd then stop for a meeting in HKG and fly from there.
Crazy, I know. But I'd rather spend those 900 for QR J to Thailand than AB economy to Japan

I believe many would do the same haha