Based on the pictures alone, I don't see anything wrong with yours. In fact, your caviar appears more shiny and quilts appear more puffy -which is what I look for and prefer when choosing CFs.
It seems to be quite common that different batches of classic flaps can vary. In my experience, the older flaps tend to have better quality than recent years. I would keep it and get it authenticated for peace of mind.
If I was to make an observation. I would say your friend's bag may have been hit by corporate greed "shrinkflation". Maybe Chanel is trying to save cost by making their bags smaller now? eg. The new extra mini - make a bag 2cm smaller (10% smaller) so they can charge $200 less