So I just re-purchased an EM1 and 12-40 plus 40-150 in a great value kit. I had the camera a couple of years back and used it for a while but ditched it when my Sony 24-70f4 arrived. However, I really missed the incredibly light weight and edge to edge sharpness of the Oly with 12-40 and I missed its good weather sealing. It's the perfect country hike combo for English weather.
But... I never really found a way, and now again can't find a good way, to deal with the fact that auto ISO always selects a shutter speed too high compared to what it should, with great IBIS, allow. That means that it often uses an ISO higher than it needs because it's too conservative with shutter speed.
I found a clunky way around this, which is to use M mode and set the lever position to 2 to allow me to change ISO with the front dial. Trouble is, with a zoom that means constantly switching the lever between 1&2 in order to change shutter speed as zoom length changes.
I keep thinking there must be a way around this. It's a mature system with a good record of FW updates. But I can't seem to find a better method, so my ISO is often 2 or 3 times what it needs to be.