For those who care, I'm gradually migrating photographically to full frame with the acquisition before Christmas of a Nikon D610 body, swapped for a guitar I didn't really use. In one sense it's a bad deal, because the guitar will retain all it's value plus a bit in 10 years time, while the camera will be worth nothing, but OTOH at least it will get used.
Now I have the slightly stressful task of trying to build up a range of lenses at lowest cost possible and with minimal redundancy and highest quality. Ebay has been occupying FAR too much time, and I've also been trying to learn the ins and outs of Nikon and compatible lens ranges (never assume that a lens is good - there's some terrible junk out there at a high price, bargains few & far between). Since image quality is *one* of the key reasons for using full frame, chucking a lousy lens on the camera seems somewhat pointless, and I've been getting used to the camera with nothing more than a 'nifty fifty' in place.
Experience so far is mixed. Image quality at high ISO is excellent compared to the Sony (3200 is fine, even 6400 is usable) but image quality in other respects, like colour balance, is all over the place. The large pentaprism viewfinder is clear and bright compared to what you'd find on even a decent APS-C camera, but in low light it's not a patch on the Sony EVF - that will of course be the opposite in sunlight, where EVF really fails. Low light focussing is also relatively hot & miss compared to the Sony, and when it comes to taking a picture, there's a huge amount of 'stuff' moving around inside compared the the mirrorless SLT cameras.
It's a heavy, bulky, complex and slightly poorly laid out device by comparison, but with noticeably higher image quality and more control over depth of field. I don't have any images on here (linux desktop) but may get some up later.
*edit - the promised images*
Nikon D610 plus Nikkor 50 1.8 AFS on auto-iso.
To quote Ben "the mini is a car for iPhone owners".
The honeymoon is over now, and the thing that irritated me to this point? The naggy computer that tries to second-guess when it needs servicing, brake pads changing etc etc. It's still great to drive (the ordinary mini cooper I had on loan while it was being serviced was even better) but suddenly it feels like it's been spoiled, from being a real car to being a computer with wheels and an engine. I feel like it's nannying me. :p
Don't get me wrong - it IS still great to drive - but if I want to change the brake pads myself then that's what I want to do, rather than have to go back to the dealer (Oxford Mini BTW - first experience wasn't so good, but this latest time they did really well). It's the first car I've owned in a very long time, probably about 20 years, that I've felt safe to press on with instead of having to drive cautiously round each corner, though that only applied when solo.
2 days before the 28 day evaluation period was up I reverted back to windows 8.1 on the work machine, not because windows 10 is bad, but because Dell's W8.1 drivers don't work properly. W10 was generally very good, though not really a great deal different in day-to-day use from 8.1, but some things didn't work or fell over, and in the end it was better to revert. Maybe I'll try again in the spring.