after 2 years, my macbook pro 1047 mark early2011 health cycles and 76% battery. After all this time I realized that the battery also wears cycles, due to the requirement to sue him. To your question, if it is normal that you lost 7% battery performance, yes it is normal ... if your friend is proque different brand are subject to different activities. The calibration is fine, but nothing will stop you wear. With the advantage that no air no heat so the solid disc, however I would not worry if I were you.
Luck!