MirrorLessons put together an expansive comparison between the Olympus OM-D EM1 Mark 2 and OM-D EM1. MirrorLessons is very positive about the camera over all, but surprisingly they say that the Fujifilm X-T2 and Sony a6500/a6300 out perform it at autofocus.
Make sure you set aside some time for this comparison because it’s a long one, but in brief this is how they felt.
“I really like the new camera. Spending one month and half with it allowed me to appreciate most of the new technology and features as well as all the little improvements. The OM-D E-M1 II is an excellent upgrade in comparison to its predecessor. It feels more robust and more comfortable in the hand, the amount of customisation available is impressive and the improved battery life makes a big difference.”
When you have the time you can read the full comparison/review here.