Oly Em5 using Leica glass

I have an old Leica (or Pana Leica) 14-50 )2.8-3.5 and decided to use it on the EM5.... I was astonished at how sharp it is... Yes, heavy, but not terribly so... and autofocus is pretty quick. I use the camera IS. I feel now I have a semi fast zoom without spending serious $$$$