I have bought and supported four thirds starting back with the E300 (still have it). I now have a EM5 and I really love it a lot.
I had thought with the advances Olympus was making in M4/3, especially with the OMD series, that the sensor size was finally being accepted by more folks.
Now it looks like Sony is pushing the envelope way out there with it's A7RII.
Sounds a little like "the grass is greener ..."
I know ...it's about three times the cost of a EM5MkII!
Still, the prices will continue to drop on full frame sensors.
Not if they keep on stuffing more pixels in - but the A7S was more expensive than the A7R. And they might be picked up quite cheaply very soon - why not save yourself some money?
And some of the lenses that most would use on a RII are not THAT large.
More wishful thinking - some might be acceptable size but a dedicated M4/3 lens of the same equivalent length will almost certainly be smaller. If one looks across the M4/3 room there are such cameras as the GM1/5 that provide a complementary small size body to match. So if size is really your problem then think small within the M4/3 format.
Once the new EM1 MkII shows up, I would bet they address the 4K, and it would not surprise me if they get a bit of help from Sony on the focusing front.
Video ho-hum for those that don't do it. I have Panasonic and still don't do video ...
But the sensor is getting left behind, and not just in size!
I don't see the 4/3 sensor as "left behind" any more than I see the "1" sensor as "useless" - once images are good enough then sensor size gets a bit like worrying about manhood ....
So is it time?
Only an individual with money to burn knows whether they need another camera. Moving to a complete new system is a huge leap of faith and a lot of money if you already own a decent swag of lenses. The A7 series is certainly more desirable now that Sony seems to have addressed the user interface and improved the many clunky controls and the grip - they even have provided electronic shutter on the A7R but I am not sure if the mechanical one is less noisy.
I am one of those caught with a suite of lenses - in this case Canon EF ones. The A7R was a way to get an evf instead of a mirror-ovf and adapters that would AF my lenses.
However the AF was slow-variable to non existent even though other lens functions worked. The A7R has many awkward controls - neatly overlooked by those who could put up with anything to get that FF sensor image. The menu button on the MkII still resolutely hangs on to the left hand operation - not terribly useful when the same hand is supporting a sizable FF lens.
However I am now twice sour - I have an expensive A7R that takes great images but is not nice to use even if the images are great. Now the same camera has been made completely redundant (the Sony way) by fixing most of the faults that Sony should not have been there in the first place and to cap it off the electronic adapters are now said to give true fast focus with Canon EF lenses .... arrggh.
And of course their is the rumoured A9 - rangefinder style FF sensor body - buy the A7RII, junk the A7R and in no time flat (Sony way) they will soon enough have multiple A9 bodies and then the A7III on the market. Like ... how many variations of the NEX were made?
Surely if the FF sensor is the answer to all prayers then just one properly sorted out FF body might have done the job?
Oh, and whilst Sony has been good with a smorgasbord of bodies, they have been less provident with a similar buffet of suitable FF capable lenses to give their FF sensor bodies proper exercise.
But the A7RII is a very desirable camera my excuse for that desire is that I already have the cache of lenses - however I sincerely wish I had not bought the A7R. Furthermore the A9 is more in line for what I really need.
My money is burning in the M4/3 direction at the moment.
