Agree with a lot of the above including the feeling of wasted space in the new A380. Definitely prefer the A380 over B777 for space and comfort; it's much quieter and smoother.
In someways I liked the old A380 over the new A380. In the new one, the person across the aisle is clearly visible while dining. You're both faced towards the aisle with the door open leading to awkward eye contact.