The EM1 II is my "go to/travel camera, with 12-40/2.8 Pro and just recently the new 40-150/4 Pro. Generally speaking I photograph things that don't move (except leaves, trees and water)but the last couple of weeks in Antigua and Barbuda I attempted to photograph terns close up, which fly very fast with a darting, zig-zag movement, really too fast for the Olympus tracking. Would any cameras' AF keep up with these - I suspect not? A more pertinent question is would the OM-1 be significantly better than the EM1 II?