KLM will roll out a flat bed in their 747-400 business class cabins over the course of the next year, replacing the angled seats that they’ve had for a while now. The new seats by BEAerospace, are similar to those found in United Airlines’ BusinessFirst cabin, which is to say they are perfectly comfortable if, perhaps, slightly hard.
The KLM seats were fine for the return trip from Europe if you were reclining and awake, but nearly everyone who has flown them overnight has found themselves 5 miles over Greenland crumpled into a ball at the bottom of the seat where they have slowly, slowly slid down over the course of 2 hours.
The only slight drawback is that they will reduce the number of seats in the cabin from 42 to 35 to accommodate the new design.
Meanwhile, SAS, which has been struggling financially, announced (apparently) in this Danish article that they will not install flat beds into their long-haul A330 and A340 aircraft because (they say) the market does not demand it. Their seats are OK, but they’re aging and don’t hold a candle to an actual flat seat. Nearly all other Star Alliance partners flying Trans-Atlantic have moved to flat beds (or are in the process of moving to fully flat beds).