Those look like nice orion tests seems the lens is working well how many subs did you use?
I use the Olympus OMD EM1 with Zuiko 150mm F2.0 and performance is great as long as I stack more than 20 minutes worth of 0.5-1 minute subs with enough darks.
Here is my result from 46x 30 seconds at F2.0
https://www.flickr.com/photos/plantn...-qz1mZf-qyrS79
Next I will try to accumulate 1-2 hours worth of data.