People can argue till the cats come home if it is better or worse than the Oly cams , I say I shoot Sony now so who cares as long as it does the job. This is a big reason I have my heart on saying this is the Camera of the Year 2014. This is a big plus right here, solid mount and much much better ergos.
Hi There Guy
Having used the E-M1 since it came out, I've got quite a lot of insight into that. Olympus have some great ideas (the push/pull MF is really nice) and some great lenses (notably the 75 f1.8 and the new 40-150 f2.8 zoom). I suspect their IBIS works a little better, but as you've proved to yourself, the A7ii IBIS works really well.
Yesterday I did a country brick wall test (flat hedge) between the Olympus 12-40 f2.8 zoom and the Sony / Zeiss 24-70 f4. I was expecting the Zuiko to be much better, but it was only a little better in the corners, and not really as good in the middle.
I'll be interested to see what happens with the next Olympus announcement in January, but my current reaction is that the A7ii is going to win this time.
I was really surprised that they came out with it - but for me it solves all the problems of the A7 (and some).
I will still be using my M with most M lenses most of the time (I still think it's the better solution for me personally, especially for wide angle), but I'm very close to honing down to only the M and the A system (a really good partnership I think).
Still - I'm not going to be precipitate, but I do like this camera (Oh Yes).
High ISO isn't that bad either (ooc - no noise reduction):
ISO 6400 1/40th f4 24-70 zoom at 39mm