Moving from D90 to OMD5 Question

I made the move from a D200 to the E-PL2 then shortly after E-PL5.  I haven't regretted it one bit. Image quality with the 5 (the same sensor as the OMD) is significantly better across the board.  As far as focus, you won't have any problems at all on your trip.  When people talk about speed issues, they're talking about high speed focus tracking.  The type of stuff you're talking about won't be a problem at all.  I'm actually VERY impressed with the speed of the E-PL5 in just about every aspect.