I'll throw my two cents in this thread. Have flown Turkish business on 777, 789 and A350. 777 seats most comfortable. The new seats on 789 and A350 are the most uncomfortable flat bed seats I've ever experienced on any airline. They are uncomfortable as seats and terrible as beds. Really do feel cramped. They do offer a lot more privacy but at a cost in comfort. Aisle access for everyone a plus, but not a deal breaker for me. Lavatories are not well thought out on 789. Food still pretty good but was better 5+ years ago. On recent flights service was fair at best (nothing memorable). I will still fly Turkish when it makes sense for schedule and price but honestly will seek out 777 routes and avoid the 789 and A350 routes.