Theres a lot of ..happy wiht the change and what your not missing... but what exactly is anyone gaining form the swtitch and is the gain equal to the cost.. where you not happy wiht your canon shots?
I am more than happy wiht the results I get using my current canon gear and can't think of nay reason to change... So whats the advantage ?
Once again, only from my experience
Having tested mirrorless and stuff, it really became clear to me that this was the right way for ME to go when I wanted to upgrade gear.
And Canon's pricing of the MKIII made it easier as well..
Weight - as I travel a lot to assignment abroad and airlines are getting VERY picky about the weight of hand luggage.
Carrying 3x 1DXmkii vs 2xA9mkII ..the size and weight is a big factor.
And add the 3-4 lenses, batteries, etc to this.
I can squeeze all my needed Sony gear to hand luggage and be almost with-in the limits.
Where as with Canon gear.. my hand luggage often weighed about 23kg.
I know - this is very particular to my situation, but something that was important to me.
As there have been more times in the last year or so, when the hand luggage is weighed and if the limit is 5kg.. they don't look at 23kg too kindly
My shoulders do also like the lighter weight after long tournaments
FPS - yes, the 1DXmkIII does sort of match the A9mkII
But I do like the 20fps .. even if it does give more to shift through at editing.
EVF - again, personal preference, but I do actually like that (now) more than what I had on Canon.
Image quality/percentage of keepers - Is this just that I have better adjusted to using Sony and setting it 'correctly'. But I do like to colours and files that I get from Sony, compared to Canon.
Percentage of keepers .. maybe not a huge change, but there is a shift upwards in the amount of keepers I get.
Firmware updates : These seem to bring more functions to the camera, compared to what can be done for a DSLR. Looking back through the A9 firmware updates from since the launch. The camera really did improve a lot during the couple of years.
Video : Find this easier and quicker to use than on my Canon DSLR.
Price/Size of batteries : OK - they don't last as long as a DSLR battery.. but cost less and it is easy enough to have plenty of spares in the bag (without adding tons of weight)
There are few things that for me have made it worth the change/swap.
And the cost really wasn't that much in the end, as maybe I had accumulated Canon gear that was not needed .. so there was a bit of a cull of gear as well.
BUT!!
Do I miss some things from Canon.. of course I do. After all I used that gear for well over a decade.. and it had been the only gear I used (apart from some Olympus back in the 80's and 90's).
- Sony does not have a 300mm f2.8 lens - that I do would buy the instant it comes out.
The 400mm f2.8 just isn't a lens I need - as I do not cover enough football to justify it.
- Familiarity of Canon - still at the moment I look at some Sony Menu bits and expect things to be where they were with Canon.
Was I happy with my images from Canon??
Yes
Could I have gone on using 1DX mkII and been satisfied?
Yes
Would I have paid what the new 1DX mkIII costs??
No
I am happy to have switched to mirrorless?
Yes
Who knows, maybe in a year or two - all you photographers using DSLR cameras will be laughing at me and telling me how stupid of a choice I have made.
But for now - the Sony is working great for me, I am happy with the images, clients and happy with them...