I’ve owned this lens for a little while and not truly recognised its capabilities, sharing here after 9 months some examples, mostly bare some with the 1.4 2X extenders . Its quite an extraordinary lens, well done Olympus!
This photograph of a squirrel was shot a few days ago and is the equivalent of 1200mm (35mm style) using the 2x extender and stopped down to f10 and shot at 1/400 hand held with just a bean bag for support. I’m more than impressed it can deliver images like this.
For context the shot below this one is from the same vantage point using a 35mm equivalent, with a keen eye you can just make out the squirrel half way up the tree trunk.
15mm (35mm equiv) view
philhutchinsonphotography.net 