Yeah, that's it - the same banding as one can get with the 20mm. I've seen this with my own 14mm pancake in pushed shadows - but have found that it's a lot harder to produce than with the 20. While I did find that aperture makes a difference (little to no banding at f/1.7, more stopped down), I never thought to try f/22.
I had read on DPReview that the PEN-F Sony sensor didn't show this problem. Ah, well. One of the reasons I have a GX85 to go with my E-M5 II.