Upgrades on S7 are indeed very frequent,you dont actually have to be Emerald to get them,you can even score one if you are Ruby,largely because of a low number of status passengers on S7. Just wanted to give you a small reminder,if you were upgraded to J cabin,and there were no "real J passengers" (those who actually paid the fare),you are going to receive Y class service only. Was on the DME-LED service yesterday,and had the pleasure of having my own 8-seat J class cabin )))