Flights have been mostly full in my observation. A couple lighter ones in April where I snagged an empty seat but not super light. This week both my flights were oversold.
April & May are the lightest months, for most airlines. It was announced that this was a major part of the reason for the runway works taking place when they did. Runway project had been planned for years and I'm quite sure has nothing to do with EK loads being low. Keep in mind they are carried out by Dubai Airports and this kind of work is genuinely required every so often. The runway may also have suffered additional wear and tear following the 77W crash landing a few years ago