Visually at first it's going to be mostly weight loss. How much depends on how much caloric deficit you are running - rule of the thumb if you eat 500 calories less than what you burn per day you will lose about a pound/0.5kg per week. Diet is 80% of success. Your muscle gains will be low while you are losing weight, but your existing muscles will become more visible.
You see yourself every day so it's going to be hard to spot differences - compare monthly photos.
About 10% fps bump and even bigger battery life improvement at the same time borderline justifies the title in my book