60mm 2.8 Autofocus noise.

I just got the lens after I read good things about the lens.

All the reviews say the autofocus is silent. It is not as noisy as 20/1.7 but I am hearing some noise while focusing. I have couple other lenses from Olympus and they are pretty much dead silent (IS system on my E-M5 is louder). I am just wondering if this is normal or not.

Thank you.