KLM Economy Comfort seats are standard economy seats in the main economy cabin but have an extra 10cm of legroom (89cm vs the standard 79cm) and a little more recline (15-18cm vs the standard 12.5cm). The seats in Premium Comfort are wider, more padded and have far more legroom – up to 18cm more than a standard economy seat and up to 8cm more than Economy Comfort. Sometimes seats in the last row don’t recline as far as normal seats, but my seat had the same recline as every other premium economy seat.