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In my own use, Sony has no problems with IBIS
and OIS/OSS running simultaneously ... but I'm
not noticing it performing better than IBIS alone
[a7XX with A-mount] nor better than OIS/OSS
alone [a6000 with native OSS lens]. No problem
or interference if both run but no distinct benefit
noticed by me, and plz note that I'm frequently
working dim light and slow shutter times.

OTOH, Panasonic's claim that "Dual IS" is better
than either OIS or IBIS alone DOES seem, from
my use, to be really true. Panasonic OIS comes
in two flavors with silly names: "Power OIS" and
"Mega OIS" and they state that only "Power" can
combine with IBIS to create Dual IS. That also is
observable, in my experience.

So, I'm not seeing any "battle" between OIS and
IBIS. My Canon and Nikon SLRs running IS/VR
seem to provide about equal levels of IS as from
the IBIS alone in my Sonys [A-mount lenses on
a7XX and a6500 IBIS bodies].

Admittedly, any of the above that provides just a
1 stop improvement over another would escape
my notice. But by in-use observation, any 2 stop
improvement would be noticed, and on that basis
I feel that Panasonic Dual IS does offer 2 stops,
or very close to 2 stops. No hard data, but I am
doing my "most comfortable" hand held dim light
shooting with Panasonic Dual IS.

.

Yes, this is true, WD … and, when used with one of two or three OLY lenses, one can achieve, supposedly - 5.5 stops of stabilization with the E-M1 Mk. II, and 7.5 stops with the new E-M1X … absolutely amazing!!!!

Herewith - a quote from an Olympus spokesperson:

Sersuya Katakoa from Olympus says : "The in-body stabilisation itself gives 5.5 steps, and the Sync IS gives 6.5 steps with OIS lenses. 6.5 stops is actually a theoretical limitation at the moment due to rotation of the earth interfering with gyro sensors."