Having just attained Gold I'm looking forward to seeing if there are any differences. One thing I will note is that when I was waiting for my tickets to be re-issued (Y-J), I checked on ExpertFlyer to see what J seats were available on my DXB-PEK A380 flight and there wasn't one window seat showing as available. When the ticket was issued, I went in to MMB and had a few window seats to choose from (unfortunately 23A & K already gone), so, would appear that as Gold more seats are opened up for choice.

Safe & Happy Travels

S