OM-D is on order, now I just need to figure out which prime lens to get. Looking through my catalog of photos, I shoot a lot at 50mm, mind you this was with a 60D and 24-105 lens. Would that work out to be the Oly 45 1.8? 90mm on the OM-D to the 50 x 1.6 = 80mm on the 60D? Or is my math all wrong?