A:Answer I don't think there is a standard weight for microwaves of this size. I get it, you are curious but I don't think you will get a true answer on this.
I would be more curious on the durability. My first GE microwave which is similar in size, shape, and design failed on the 11 year anniversary. 11 years for a microwave is not bad. My expectation is at least 15 but ok. I still replaced it with another GE microwave cause it fits my requirements.
If weight is a determining factor for you, then it is difficult to say. There might be other variables you may have that will help in your decision making.
-Excuse my ramble.